File:Gamma correction test picture.png
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Gamma_correction_test_picture.png (497 × 345 pixels, file size: 12 KB, MIME type: image/png)
Captions
Captions
A test image for observing system-level gamma correction.
Summary[edit]
| Description |
English: Gamma correction test image with 2.6, 2.2, 1.8 gamma |
| Date | |
| 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.
Licensing[edit]
I, the copyright holder of this work, hereby publish it under the following license:
This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.
- You are free:
- to share – to copy, distribute and transmit the work
- to remix – to adapt the work
- Under the following conditions:
- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
- share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 11:20, 27 June 2019 | | 497 × 345 (12 KB) | AndreAdrian (talk | contribs) | 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 (talk | contribs) | 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 (talk | contribs) | 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 (talk | contribs) | Reverted to version as of 23:06, 30 November 2018 (UTC) | |
| 09:20, 10 December 2018 |  | 497 × 345 (12 KB) | AndreAdrian (talk | contribs) | 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 (talk | contribs) | 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 (talk | contribs) | 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 (talk | contribs) | add contrast, brightness areas. Gamma values in image included | |
| 17:35, 23 November 2018 |  | 1,133 × 453 (13 KB) | AndreAdrian (talk | contribs) | Change RGB value for non-checkered area from 127 to 128. | |
| 09:30, 22 November 2018 |  | 1,130 × 453 (12 KB) | AndreAdrian (talk | contribs) | User created page with UploadWizard |
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File usage on other wikis
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