Panasonic G5 Exposure

Saturation & Hue Accuracy
Lower-than-average saturation levels. Some issues with hue accuracy, primarily in orange through yellows.

Saturation. The Panasonic G5 produces slightly lower average saturation levels than most cameras at default settings. The Lumix G5 pushes dark red and dark green slightly, and darker blues a fair bit, but undersaturates yellow, aqua and cyan. Average saturation is 105.9% (only 5.9% oversaturated) at base ISO, which remains fairly consistent across the ISO range except at the highest ISO where it drops off a bit. Most consumer digital cameras produce color that's more highly saturated (more intense) than found in the original subjects. This is simply because most people like their color a bit brighter than life.

Skin tones. Here, the Panasonic G5 does fairly well, producing natural-looking Caucasian skin tones with a push towards pink when Auto white balance is used, giving a healthy appearance. Darker skin tones have a small nudge toward orange and red, but overall results are pretty good here. Where oversaturation is most problematic is on Caucasian skin tones, as it's very easy for these "memory colors" to be seen as too bright, too pink, too yellow, etc.

Hue. The Panasonic G5 struggles a bit with hue accuracy, pushing red toward orange, orange toward yellow and yellow toward green. The cyan toward blue shift, which we think is done to improve sky color, isn't as strong as we normally see, though. As is often the case with Panasonic models, the yellow through orange shifts and reduced saturation of yellows are especially apparent in the yarn of our Still Life test image. As we've seen with other Panasonic models, the orange-yellow shifts are significantly mitigated by shooting in raw format and using a good-quality raw converter. The bundled SilkyPix software as well as Adobe Camera Raw do much better with hue accuracy than JPEGs produced in-camera. Click here to see a Adobe Camera Raw conversion of the same Still Life shot. The camera's average "delta-C" color error after correction for saturation is 5.9 for JPEGs at base ISO, which is a bit below average these days. Hue is "what color" the color is.

Saturation Adjustment
The Panasonic G5 lets you adjust image saturation, contrast, and sharpness in five steps each. As can be seen below, the saturation adjustment is quite subtle, and works mainly on reds, as we've seen with prior models. At least contrast isn't affected much.

The table above shows results with the default as well as the two "extreme" saturation settings. Click on any thumbnail above, then click again to see the full-sized image.

Exposure and White Balance

Indoors, incandescent lighting
Better than average color with Auto white balance, but very warm with the Incandescent setting. Best color balance with the Manual setting, a little too cool with 2,600 Kelvin. Average positive exposure compensation required.

Indoors, under normal incandescent lighting, color balance is just slightly warm with the Auto white balance setting, though the Panasonic G5 does much better than most cameras in this regard. Results with the Incandescent setting are much too warm for our tastes, with a strong orange-yellow cast. The Manual setting produced the most accurate results, just a touch cool, while the 2,600 Kelvin setting which should match the color temperature of our lights is a bit too cool with a bluish cast. The Panasonic G5 required +0.3 EV exposure compensation here, about average for this shot. (Our test lighting for this shot is a mixture of 60 and 100 watt household incandescent bulbs, a pretty yellow light source, but a very common one in typical home settings here in the U.S.)

Outdoors, daylight
Slightly cool, muted colors overall, with a tendency toward high contrast under harsh lighting. About average exposure accuracy.

Outdoors, the Panasonic G5 performed pretty well, with good though slightly cool, muted color in the Far-field shot. Skintones are reasonably realistic in our "Sunlit" Portrait shot, with a healthy-looking push of pinks and reds which is preferable to too flat or yellow. Exposure accuracy is about average, as the camera required +0.7 EV compensation for our "Sunlit" Portrait shot to keep facial tones reasonably bright. That's average for this shot, but it led to some blown highlights while leaving some dark shadows. The default exposure is a little dim for the Far-field shot, but there are very few blown highlights, though some shadows are very dark. Default contrast is on the high side, but that's how most consumers prefer their photos.

See full set of test images with explanations
See thumbnails of all test and gallery images

Resolution
Very high resolution, 2,200 ~ 2,300 lines of strong detail.

In camera JPEGs, our laboratory resolution chart reveal sharp, distinct line patterns to about 2,300 lines per picture height horizontally, and about 2,200 lines in the vertical direction. (Some might argue for higher, but aliasing artifacts begin to appear before that.) Complete extinction of the pattern didn't occur until about 3,100 lines horizontally and to 3,100 lines vertically. We weren't able to extract significantly more high-contrast resolution by processing the Panasonic G5's RW2 file using Adobe Camera Raw, and the ACR conversion also shows significantly more color moiré than the camera JPEG.

Use these numbers to compare with other cameras of similar resolution, or use them to see just what higher resolution can mean in terms of potential detail.

See full set of test images with explanations
See thumbnails of all test and gallery images

Sharpness & Detail
Very good sharpness overall, though with visible edge-enhancement artifacts on high-contrast subjects. Moderate noise suppression visible in the shadows even at base ISO.

Sharpness. The Panasonic G5 captures sharp, detailed images overall, though edge enhancement artifacts are quite visible on high-contrast subjects such as the "halos" along the thicker branches and pine cones in the crop above left. The sharpening isn't nearly as evident on lower-contrast elements, such as the pine needles and smaller branches. Given its target market, the default sharpening applied is probably appropriate, as we think most users printing camera JPEGs would be pleased with the results. And of course, you can always tweak the sharpness setting to your liking, or shoot raw and sharpen for yourself. Edge enhancement creates the illusion of sharpness by enhancing colors and tones right at the edge of a rapid transition in color or tone.

Detail. The crop above right shows the effect of noise suppression in the form of smudging of individual strands together in the darker areas of the model's hair, as well as in areas with low local contrast. Processing raw files with a good raw converter can produce much improved detail and can also reduce noise reduction and demosaicing artifacts, as can be seen in the ACR converted raw crop at right. (Mouse over the links to compare.) Noise-suppression systems in digital cameras tend to flatten-out detail in areas of subtle contrast. The effects can often be seen in shots of human hair, where the individual strands are lost and an almost "watercolor" look appears.

Intelligent Resolution
The Panasonic G5 offers four levels of "Intelligent Resolution," which essentially sharpens fine detail and outlines, while reducing noise in areas with little or no detail (such as a cloudless sky). To see how well it works, compare the crops below at each setting.

In the table above, mousing over a link at the bottom will load the corresponding crop in the area above, and clicking on the link will load the full resolution image.

As you can see, fine detail contained in and around the lettering on the bottle has progressively stronger local sharpening applied as the setting is increased, while noise in flatter areas that would normally be emphasized with standard, global sharpening is actually reduced. Sharpening halos are however more visible at higher settings. According to Panasonic, the Extended setting is designed to produce more natural results when making large prints.

Raw vs In-Camera JPEGs
As noted above, the Panasonic G5 produces sharp in-camera JPEGs with good detail, though default noise reduction is a bit high at base ISO. As is almost always the case, quite a bit more detail can be obtained from carefully processing raw files than can be seen in the in-camera JPEGs, with fewer sharpening artifacts to boot. Take a look below, to see what we mean:

In the table above, mousing over a link at the bottom will load the corresponding crop in the area above, and clicking on the link will load the full resolution image.

The first crop from the left is from an in-camera Fine JPEG at default settings. The second is a raw file converted with SilkyPix 3.1 SE (the raw converter Panasonic bundles with their raw-capable cameras), using default settings. The third crop is also a raw conversion done with SilkyPix but with noise reduction and sharpening set as low as they go within the editor, and then sharpened using SilkyPix's output unsharp masking feature set to 250%, a radius of 0.3 pixels, and a threshold of 0. Adobe Camera Raw 7.2 was used for the ACR conversion at right. Default settings were used for conversion, though no sharpening was applied in ACR. The image was then sharpened in Photoshop using the same sharpening settings as we used with SilkyPix.

As you can see, the in-camera JPEG contains pretty good fine detail. SilkyPix however had trouble with the pine needles, flattening them out and making them look reminiscent of a watercolor painting. It's likely doing some fairly heavy-handed noise reduction under the hood which can't be disabled. The results we got using SilkyPix are a bit disappointing, but we must confess we didn't experiment with different settings for very long, so you may be able to do better. The ACR conversion extracted the most detail, but also shows more noise, especially in areas with little detail such as the sky. You can always turn up the luminance noise reduction (default of zero was used here), or process the files in your favorite noise reduction program or plugin if you find the noise objectionable. Bottom line, though, as is usually the case shooting in raw mode provides better detail, color, and control than in-camera JPEGs when using a good raw converter.

ISO & Noise Performance
Good noise performance to moderate ISOs, but image quality drops off quickly after ISO 1,600.

The Panasonic Lumix DMC-G5's images are pretty clean at ISOs 160 and 200, with only minor luminance and chrominance noise visible in the shadows, but as mentioned previously there's already some smudging visible from noise reduction efforts. Stronger chrominance noise reduction kicks in a ISO 400, removing much of the color noise in the hair. Luminance noise reduction is also stronger, with more smudging, but fine detail is still pretty good. ISO 800 and 1,600 continue this gradual deterioration, with increased smudging and reduced detail. A sudden increase in sharpening makes luminance noise much more obvious with a peppering effect at ISO 3,200. ISO 6,400 is worse as you'd expect, with more noticeable noise pixels and sharpening artifacts that give the image an almost crystalline appearance. These artifacts are very noticeable and distracting at ISO 12,800, along with much stronger chroma noise in the form of purple and yellow blotches. Color balance also shifts toward green at the highest ISOs.

Overall, high ISO performance hasn't improved significantly over the G3, and isn't as good as most recent 16-megapixel competitors from Olympus or Sony. We're of course pixel-peeping to an extraordinary extent here, since 1:1 images on an LCD screen have little to do with how those same images will appear when printed. See the Print Quality section below for our evaluation of maximum print sizes at each ISO setting.

A note about focus for this shot: We shoot this image at f/4, usually using one of three very sharp reference lenses (70mm Sigma f/2.8 macro for most cameras, 60mm f/2.8 Nikkor macro for Nikon bodies without a drive motor, and Olympus Zuiko 50mm f/2.0 for Four Thirds and Micro Four Thirds bodies). To insure that the hair detail we use for making critical judgements about camera noise processing and detail rendering is in sharp focus at the relatively wide aperture we're shooting at, the focus target at the center of the scene is on a movable stand. This lets us compensate for front- or back-focus by different camera bodies, even those that lack micro-focus adjustments. This does mean, though, that the focus target itself may appear soft or slightly out of focus for bodies that front- or back-focused with the reference lens. We know this; if you click to view the full-size image for one of these shots and notice that the focus target is fuzzy, you don't need to email and tell us. :-) The focus target position will have been adjusted to insure that the rest of the scene is focused properly.

Extremes: Sunlit, dynamic range and low light tests
Somewhat high default contrast and limited dynamic range. Good low-light performance.

Sunlight. The Panasonic Lumix DMC-G5 struggled a bit with the deliberately harsh lighting of this test. Contrast is a little high at its default setting, and dynamic range limited. This led to quite a few blown-out highlights in the mannequin's shirt and flowers, and deep, somewhat mushy shadows (the G5 appears to apply stronger noise reduction in the shadows) that also show some posterization at darker levels. Although skin tones around the eyes are a bit dark at +0.7 EV exposure, we prefer it to the +1.0 EV exposure overall, because there are fewer clipped highlights. It's really the photographer's choice here as to which direction to go in. For those Panasonic G5 owners that are going to want to just print an image with little or no tweaking, the +1.0 image would probably produce a better-looking face uncorrected. The bottom line though, is that the Panasonic G5 had difficulty with the wide dynamic range of this shot, at least in JPEGs with its default settings.

Because digital cameras are more like slide film than negative film (in that they tend to have a more limited tonal range), we test them in the harshest situations to see how they handle scenes with bright highlights and dark shadows, as well as what kind of sensitivity they have in low light. The shot above is designed to mimic the very harsh, contrasty effect of direct noonday sunlight, a very tough challenge for most digital cameras. (You can read details of this test here.)

Dynamic Range Analysis
A key parameter in a digital camera is its Dynamic Range, the range of brightness that can be faithfully recorded. At the upper end of the tonal scale, dynamic range is dictated by the point at which the RGB data "saturates" at values of 255, 255, 255. At the lower end of the tonal scale, dynamic range is determined by the point at which there ceases to be any useful difference between adjacent tonal steps. Note the use of the qualifier "useful" in there: While it's tempting to evaluate dynamic range as the maximum number of tonal steps that can be discerned at all, that measure of dynamic range has very little relevance to real-world photography. What we care about as photographers is how much detail we can pull out of the shadows before image noise becomes too objectionable. This, of course, is a very subjective matter, and will vary with the application and even the subject matter in question. (Noise will be much more visible in subjects with large areas of flat tints and subtle shading than it would in subjects with strong, highly contrasting surface texture.)

What makes most sense then, is to specify useful dynamic range in terms of the point at which image noise reaches some agreed-upon threshold. To this end, Imatest computes a number of different dynamic range measurements, based on a variety of image noise thresholds. The noise thresholds are specified in terms of f-stops of equivalent luminance variation in the final image file, and dynamic range is computed for noise thresholds of 1.0 (low image quality), 0.5 (medium image quality), 0.25 (medium-high image quality) and 0.1 (high image quality). For most photographers and most applications, the noise thresholds of 0.5 and 0.25 f-stops are probably the most relevant to the production of acceptable-quality finished images, but many noise-sensitive shooters will insist on the 0.1 f-stop limit for their most critical work. A full discussion of all the data Imatest produces is really beyond the scope of this review: Visit the Imatest website for details of what the program measures, how it performs its computations, and how to interpret its output.

JPEG. The graph at right (click for a larger version) was generated using Imatest's dynamic range analysis for an in-camera Panasonic G5 JPEG file with a nominally-exposed density step target (Stouffer 4110). At default settings and base ISO of 160, the results shows only 9.63 f-stops of total dynamic range, but with 8.6 f-stops at the "High" quality level. From the chart in the top left, we can see gradation tapers-off fairly smoothly at the highlight end, but steps at the shadow end are spread apart, indicative of a tendency of the deepest shadows to break up into discrete levels (posterization) if you try to brighten them too much. Although total dynamic range is quite poor because of the steep drop-off on the shadow end, the score at the highest quality level is actually pretty good for a Micro Four Thirds model, likely the result of fairly strong noise reduction in darker areas. Note, that this measurement has a margin of error of about 1/3 f-stop, so differences of less than 0.33 can be ignored when comparing results to other models.

Raw. The graph at right is from the same Stouffer 4110 stepchart image captured as a raw (.RW2) file, processed with Adobe Camera Raw using the Auto setting, then tweaked from there for best results. As can be seen, the score at the highest quality level actually went down compared to the in-camera JPEG, to 7.87 from 8.6 f-stops, while total dynamic range increased dramatically to 11.9 f-stops with a much better behaved tonal curve at the shadow end. The results at the highest quality level are still fairly good for Micro Four Thirds, but not quite as good as the Olympus E-M5, and lower than most APS-C sensors. It's worth noting here is that ACR's default noise reduction settings normally reduce overall noise somewhat (see the plot in the lower left-hand corner) relative to the levels in the in-camera JPEG, which would tend to boost the dynamic range numbers for the higher quality thresholds, however ACR did not reduce RMS noise lower than the matching JPEG in shadow areas.

Contrast Adjustment
The camera's contrast adjustment was at least some help in handling the harsh lighting.

The Panasonic Lumix DMC-G5's lowest contrast setting does a good job bringing out detail in the shadows and darker midtones, but it does little did little to preserve clipped highlight detail in the Sunlit Portrait shot. (The default Far-field shot had few highlights clipped to begin with.) Overall, the camera's limited dynamic range in JPEGs makes it perform below average in this situation.

The table above shows results with the default as well as the two "extreme" contrast settings. Click on any thumbnail above, then click again to see the full-sized image. The control for contrast was not quite as subtle as saturation was in its effect, though it appears to leave the strongest highlights at about the same values, then applies a proportional boost to tones as it moved down the tone curve. To make the most of it in a shot like this, you'll want to expose for the highlights and apply a good amount of contrast reduction.

Panasonic's Intelligent Dynamic Range
The above shots are examples of Panasonic's Intelligent Dynamic Range Control (or iD-Range) at work, with no exposure compensation. Note that the camera does not take multiple shots and merge them as HDR mode does (see below). It's a system that adjusts local contrast and exposure more akin to Nikon's Active D-lighting, Canon's Automatic Lighting Optimization or Sony's Dynamic Range Optimization.

There are three levels of iD-Range available on the Panasonic G5: Low, Standard and High, plus Off. It's automatically invoked in iAuto and some scene modes and manually selectable in PASM modes. For our Sunlit Portrait shot, the Low and Standard settings are an improvement over the Off setting, lightening shadows and delivering a better exposure overall, while doing a good job at holding on to highlight detail. (The histograms show how shadows were boosted while highlights were kept roughly the same.)  The High setting however seemed to give up on protecting highlight, clipping a lot of them by halving the shutter speed (from 1/60 to 1/30s).

Because multiple images are not combined in this mode, actual dynamic range doesn't change, however iD-Range can provide a useful extension to the practical dynamic range of the Panasonic G5.

New HDR mode
Here, you can see the Panasonic G5's new High Dynamic Range mode at work with our Far-field shot. HDR mode takes three images at different exposures and combines them to increase dynamic range. Mouse over the links, and click on them the view the full resolution files. Notice the double images and ghosting of objects or people moving between frames. Also notice the angle of view is narrower in the HDR image, likely because the image has been cropped and upsized during the alignment process.

Face Detection
Like most cameras these days, the Panasonic Lumix DMC-G5 has the ability to detect faces (up to 15 in a scene), and adjust exposure and focus accordingly. The G5 does so automatically in Intelligent Auto (iAuto) and iAuto Plus modes, when Portrait scene mode is selected, or when Face Detection AF mode is enabled. As you can see from the examples above, face detection made a slight difference in Aperture Priority at f/8, but iAuto mode really performed well where the camera had control over aperture, and automatically applied Intelligent D-Range.

Low Light. The Panasonic Lumix DMC-G5 performed fairly well in our low light test, able to capture bright images down to the lowest light level we test at, at all ISO settings, though exposure varied a bit. The darkest level equates to about 1/16 the brightness of average city street lighting at night, so the Panasonic G5 should be able to take well-exposed photos in almost any environment in which you can see well enough to walk around in.

Using default noise reduction setting, noise is low fairly up to ISO 1,600. At ISOs 3,200 and above, noise is a little higher at lower light levels compared to most recent cameras with APS-C sensors, but not bad for a MFT model. Some minor horizontal banding is visible in the shadows at higher ISOs and lower light levels, but nothing unusual. We didn't notice any issues with hot or stuck pixels. There is a hint of some very minor heat blooming along the bottom of images at very high ISOs, but again, that's not unusual. Automatic color balance was pretty good (just slightly cool), something that's not a given at such low light levels.

The camera's autofocus system was able to focus on our subject down to below the 1/16 foot-candle light level unassisted with an f/2.8 lens which is excellent, especially for a camera with contrast-detect autofocus. The Panasonic Lumix DMC-G5 does have a focus-assist light option which allows it to autofocus in total darkness, as long as the subject is within range and has sufficient contrast.

How bright is this? The one foot-candle light level that this test begins at roughly corresponds to the brightness of typical city street-lighting at night. Cameras performing well at that level should be able to snap good-looking photos of street-lit scenes.

NOTE: This low light test is conducted with a stationary subject, and the camera mounted on a sturdy tripod. Most digital cameras will fail miserably when faced with a moving subject in dim lighting. (For example, a child's ballet recital or a holiday pageant in a gymnasium.) Thanks to their phase-detect AF systems, digital SLRs tend to do much better than point & shoots, but you still shouldn't expect a quick autofocus lock with moving subjects. The G5 uses contrast-detect autofocus, as is found in most point & shoot cameras, so its low-light focusing ability is less than that of some SLRs with phase-detect systems. That said, though, the larger, more sensitive pixels of the G5's sensor do better under dim lighting than do the tiny pixels of most point & shoots, (A useful trick is to just prop the camera on a convenient surface, and use its self-timer to release the shutter. This avoids any jiggling from your finger pressing the shutter button, and can work quite well when you don't have a tripod handy.)

Print Quality

Good, sharp 20 x 30 inch prints at ISO 160 and 200; ISO 1,600 shots look better at 8 x 10; ISO 12,800 shots make a decent 4 x 6-inch print.

ISO 160 shots look great at 20 x 30 inches.

Testing hundreds of digital cameras, we've found that you can only tell just so much about a camera's image quality by viewing its images on-screen. Ultimately, there's no substitute for printing a lot of images and examining them closely. For this reason, we now routinely print sample images from the cameras we test on our Canon Pro9000 Mark II studio printer, and on the Canon Pixma MP610 here in the office. (See the Canon Pixma Pro9000 Mark II review for details on that model.)