File:Gamma correction test picture.png

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Summary

DescriptionGamma correction test picture.png	English: Gamma correction test image with 2.6, 2.2, 1.8 gamma
Date	21 November 2018
Source	Own work
Author	AndreAdrian

The test image needs pixel accurate display. Use Wikipedia picture attribute frame and web browser zoom 100%. The average lightness of the 3%/97% lightness checkered area is integrated in the observers eye to 50% lightness. The non-checkered area lightness is 0.5^(1/gamma). If the system gamma (operating system, graphics card, monitor) is equal to the test image gamma, checkered and non-checkered areas have the same lightness.

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File history

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	Date/Time	Dimensions	User	Comment
current	11:20, 27 June 2019	497 × 345 (12 KB)	AndreAdrian	Reverted to version as of 17:42, 13 December 2018 (UTC). This test picture allows better calibration.
	19:56, 13 December 2018	487 × 337 (12 KB)	Dicklyon	Reverted to version as of 06:11, 13 December 2018 (UTC); the numbers are not useful, and nonstandard; I'll update the caller
	17:42, 13 December 2018	497 × 345 (12 KB)	AndreAdrian	Reverted to version as of 09:20, 10 December 2018 (UTC) Display of the image must be pixel accurate. Changing the image without edit the section does confuse the wikipedia picture attribute frame. Therefore going back.
	06:11, 13 December 2018	487 × 337 (12 KB)	Dicklyon	Reverted to version as of 23:06, 30 November 2018 (UTC)
	09:20, 10 December 2018	497 × 345 (12 KB)	AndreAdrian	Contrast and brightness Areas have now numbers for easier adjustment. Gamma Areas have again checkered pattern.
	23:06, 30 November 2018	487 × 337 (12 KB)	AndreAdrian	Use horizontal lines instead of checkered pattern to avoid distortion due to monitor rise time.
	13:58, 29 November 2018	487 × 338 (9 KB)	AndreAdrian	Checkered area uses 3%/97% pattern to avoid non-linearity problems with lightness 0%/100%.
	14:55, 28 November 2018	487 × 337 (9 KB)	AndreAdrian	add contrast, brightness areas. Gamma values in image included
	17:35, 23 November 2018	1,133 × 453 (13 KB)	AndreAdrian	Change RGB value for non-checkered area from 127 to 128.
	09:30, 22 November 2018	1,130 × 453 (12 KB)	AndreAdrian	User created page with UploadWizard