GH2 vs EM5 RAW Base ISO Image Noise Comparison

Started Apr 29, 2012 | Discussions thread
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GH2 vs EM5 RAW Base ISO Image Noise Comparison
Apr 29, 2012

Have had a look at RicksAstro 's recently posted EM5 and GH2 RAWs recorded at base ISO Gain:

GH2, ISO Gain=160 : http://www.ricksastro.com/temp/em5/GH2_16P1080019.RW2

EM5, ISO Gain=200 : http://www.ricksastro.com/temp/em5/EM5_16P4180038.ORF

From: http://forums.dpreview.com/forums/read.asp?forum=1041&message=41260897

The same Lumix G 20mm F/1.7 lens was used, the same F-Number of F=1.7 was used, and the same Shutter Speed of S=6 was used when these test-shots were recorded by RicksAstro .

RawDigger reports that the ratio of the Average/Peak levels between the EM5 and GH2 equals -0.346 EV (full image-frames). As a result, the processed EM5 images were scaled by a difference of +0.35 EV in order to normalize for that difference in RAW-level scaling. 800x800 pixel 100% crops were chosen from the lower-left and the lower-right areas of the GH2 and the EM5 images.

Rather interestingly, the White Balance parameters that each camera used are very different. The fluorescent lamp color-temperature in the test-shot scene was (likely) something in the range of 3,000 Degrees Kelvin. While the GH2 used a Color Temperature of 3273 Degrees K and a Tint of 0.824, the EM5 used a Color Temperature of 5617 Degrees K (a color-temperature nearly double that of the the flourescent lamp light-source), and a Tint of 0.531. The following analysis was conducted using the White Balance parameters (presumably) chosen by each camera's AWB system. Thus, it appears that the nature of the Bayer array RGB color-filters is significantly different .
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Used RAW Therapee 4.082 for Win32-bit in the following configuration when processing:

Exposure tools :
Neutral
Exp. Comp. - For the EM5 used a value of +0.35 EV more than for GH2.
Highlight recovery amount=0
Black=0
Shadow recover=0
Brightness=0
Contrast=0
Saturation=0
Lab Brightness=0
Lab Contrast=0
Lab Saturation=0
Tone Curve=Linear
All other functions disabled.
.

Detail tools:
Contrast by detail levels disabled.
All other functions disabled.
.

Color tools:

White Balance = Camera Settings

Color Management:
Input profile=No profile
Working profile=sRGB
Output profile=sRGB
Outpt gamma=standard_g=2.2

All other controls in their default state.
.

Transform tools:
Crop = enabled
Width=800 pixels
Height=800 pixels
All other functions disabled.
.

Raw tools:
De-mosaicing algorithm=AMaZE
False color suppression steps=0
All other functions disabled.
.

16-bit sRGB color-space TIFF output image-files were exported from RAW Therapee 4.082 . XnView 1.986 was used to convert the 16-bit TIFs to loss-less (no Chroma Sub-sampling, and a 100% Quality Factor, meaning no Quantization data-compression) 8-bit JPGs for display below.
.

Here is the GH2 Sample 1 (RAW scaling of +5.00 EV):

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Here is the EM5 Sample 1 (RAW scaling of +5.35 EV):

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Here is the GH2 Sample 2 (RAW scaling of +5.00 EV):

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Here is the EM5 Sample 2 (RAW scaling of +5.35 EV):

.

What do you think of the differences in visible image-noise between the GH2 and EM5 samples ??

DM ...

Panasonic Lumix DMC-GH2
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