Leica Adding a "Gamma Curve" to a digital image: Thinking out Loud and Experiments

BrianS

Legend
Jul 7, 2010

I've made the statement in the past that the M Monochrom has the lowest non-uniformity of any sensor that I've used. The low-noise level is amazing. I've looked at the numbers using custom code, but never generated metrics on performance. That- I used to do for digital sensors in the early 1980s.

After several years, I can verify that comment.

This table is from the above website, the last two columns are dark signal non-uniformity (DSNU) and Photo Response Non Uniformity (PRNU) is - like Fixed Pattern Noise (FPN) - a way of expressing errors in the output from sensors. The lower the value, the better the raw image. I will never sell my M Monochrom, or M9. My M8 is one of the last in the production line. I'll keep it as well. 35 years ago- would have selected the M Monochrom based on the last two columns alone.

Camera ModelISOBlack
Level
Range
Black
Column
Metric
Black
Row
Metric
Illuminated
Column
Metric
Illuminated
Row
Metric
DSNU ▾PRNU



Leica CL1000.1110.0040.0150.0150.0106%0.4%
Leica CL[HCG]4000.1380.0040.0080.0050.0069%0.4%
Leica M (Typ 240)2000.0280.0090.0050.0100.005213%2.0%
Leica M (Typ 262)2000.0330.0060.0040.0140.007327%0.6%
Leica M Monochrom3200.0970.0040.0290.0040.0086%0.1%
Leica M Monochrom (Typ 246)3200.0080.0130.0080.0100.03986%0.5%
Leica M-D (Typ 262)2000.0310.0130.0060.0080.00794%0.5%
Leica M81600.0410.0050.0060.1570.0126%5.1%
Leica M91600.1400.0050.0050.0070.0065%0.4%
Leica M101000.0790.0060.0090.0060.00657%0.3%
Leica M10 Monochrom1600.0500.0110.0210.0060.00529%0.2%
Leica M10 Monochrom[HCG]8000.0410.0110.0110.0050.00435%0.4%
Leica M10-P1000.1190.0070.0090.0220.01074%0.4%
Leica M10-R1000.0840.0130.0200.0070.00636%0.3%
Leica M10-R[HCG]4000.0350.0070.0100.0060.00441%0.4%
Leica Q (Typ 116)1000.3030.0050.0560.0140.00813%0.8%
Leica Q2500.0640.0070.0090.0180.00812%0.4%
Leica Q2[HCG]8000.4140.0040.0070.0050.00520%0.7%
Leica S-E (Typ 006)1000.3050.0050.0090.0240.0114%0.6%
Leica S (Typ 007)1000.0760.0390.0260.0300.01541%0.4%
Leica SL (Typ 601)500.6800.0100.0610.0090.00714%0.6%
Leica SL (Typ 601)[HCG]2000.3120.0120.0150.0050.00523%0.5%
Leica SL2501.5870.0040.0100.0200.0139%0.3%
Leica T1000.0050.0050.0060.0210.00711%0.4%
Leica TL1000.0040.0050.0050.0180.01113%0.4%
Leica TL21000.0000.0040.0040.0240.01352%0.3%
Leica X11000.1350.0040.0050.0300.10672%0.4%
 
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