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Do you know any open source/free software C++ libraries to manipulate images in these formats: .jpg .gif .png .bmp ? The more formats it supports, the better. I am implementing a free program in C++ which hides a text file into one or more images, using steganography.

I am working under Unix.

Vertexwahn
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lurks
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7 Answers7

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ImageMagick can manipulate about anything and has interfaces for a dozen of languages, including the Magick++ API for C++.

Francis Fajardo
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Huppie
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@lurks: I assume that you are looking for LSB shifting? I did some stego work a couple of years ago, and that's how it appeared most apps worked. It appears that ImageMagick (suggested by others) allows you to identify and manipulate the LSBs.

Thomas Owens
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It takes some setting up, but I'm a fan of Adobe's GIL (now part of Boost).

Francis Fajardo
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Max Lybbert
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Have you considered GDI?

-- Kevin Fairchild

Kevin Fairchild
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FreeImage is pretty solid. It has a C interface but is more C++-like in its implementation.

Jim Buck
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I like VXL.

VXL (the Vision-something-Libraries) is a collection of C++ libraries designed for computer vision research and implementation. It was created from TargetJr and the IUE with the aim of making a light, fast and consistent system. VXL is written in ANSI/ISO C++ and is designed to be portable over many platforms.

Francis Fajardo
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Moe
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For .png images you could look into Cairo (and CairoMM). There's also Anti-Grain which people consider very fast.