tweakpng | A low-level PNG image file manipulation utility for Windows | Computer Vision library

by jsummers C++ Version: 1.4.6 License: GPL-3.0

X-Ray Key Features Code Snippets Community Discussions(1)Vulnerabilities Install Support

kandi X-RAY | tweakpng Summary

tweakpng is a C++ library typically used in Artificial Intelligence, Computer Vision, Qt5 applications. tweakpng has no bugs, it has no vulnerabilities, it has a Strong Copyleft License and it has low support. You can download it from GitHub.

A Windows application for viewing and editing PNG metadata. For usage instructions, see tweakpng.txt. For development instructions, see tweakpng-src.txt.

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Support

tweakpng has a low active ecosystem.

It has 232 star(s) with 19 fork(s). There are 18 watchers for this library.

It had no major release in the last 6 months.

There are 6 open issues and 5 have been closed. On average issues are closed in 7 days. There are no pull requests.

It has a neutral sentiment in the developer community.

The latest version of tweakpng is 1.4.6

Quality

tweakpng has no bugs reported.

Security

tweakpng has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

License

tweakpng is licensed under the GPL-3.0 License. This license is Strong Copyleft.

Strong Copyleft licenses enforce sharing, and you can use them when creating open source projects.

Reuse

tweakpng releases are not available. You will need to build from source code and install.

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tweakpng Key Features

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tweakpng Examples and Code Snippets

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Community Discussions

Trending Discussions on tweakpng

PNG Gamma Correction

QUESTION

PNG Gamma Correction

Asked 2018-Jun-25 at 22:45

I used the DirectXTex library to capture a screenshot of a DX11 game and save it to a file. The problem is that it works great when I save it as jpeg but if I save it as png the image would become super bright and washed out. I checked the image using TweakPNG and found out the gamma was set to 1.0 and that's what's causing the problem. I checked images taken by some other software including the snipping tool and they seem to use 0.45455 as gamma or they leave out the gamma value altogether.

I don't know if DirectXTex will let me specify a gamma value or not. I'm not even sure if WIC has this functionality as I can't seem to find useful information either on MSDN or other sites.

...

ANSWER

Answered 2018-Jun-25 at 22:45

By default DirectXTex will add the sRGB chunk to the PNG file it writes if the format is DXGI_FORMAT_*_SRGB. Furthermore, if the format is not DXGI_FORMAT_*_SRGB I explicitly remove the sRGB chunk and set the gAMA chunk to 1.0 because otherwise WIC always adds the sRGB chunk.

You can see this behavior in the code in both DirectXTexWIC.cpp and in the DirectX Tool Kit's ScreenGrab.cpp module.

If you are not doing 'gamma-correct' rendering where your render target is an DXGI_FORMAT_*_SRGB format but have sRGB content in a DXGI_FORMAT_* format, then my recommendation is that you pass an sRGB version of the format to the function.

In DirectXTex, that's easily done with the MakeSRGB function.

Gamma correction in the PNG format is a bit of a mess. See this blog post

Source https://stackoverflow.com/questions/51031085

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install tweakpng

You can download it from GitHub.

Support

For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .

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