Hi everyone,

I'm having issues with image files in C++. I'm basically trying to read in image files and change pixel values. The problems are:

1) How do I do this in C++ in the first place?

2) Should I be expecting integer values from 0 to 255? Or some other type, and then what value ranges?

3) Is there a C++ API like there is for Java?

Help?

what sort of image files? jpegs, tiffs, ...? have a look into SDL_Image/imlib/imlib2 they can load most formats i can think of.

Take a look at the QT libs. They are usually installed by default in most linux distros, and can be used without a gui.

Hi guys,

How do I learn how to use the tools you suggested? Is there a website you can direct me to?

--
Kit

QT is developed by TrollTech and they have all the documentation on their website. the documentation should be with any distro that includes qt.

the sdl_image docs are on their website somewhere www.libsdl.org both imlib and imlib2 come with some great documentation in their source .tar.bz2, depending on your distro you might have it installed in /usr/share/doc/imlib-version/ if not grab their latest .tar.bz2 and get it from there.

imlib2 tar.bz2
imlib tar.bz2

qt is very powerful and very good gui library but i would say its far too heavy for simple image loading/manipulation. i would agree that qt is present on most desktop systems but i doubt its present on web servers or small embedded systems, so if your program was gonna be used to generate live images for apache or something similar then i wouldnt reccomend qt. also i believe imlib{,2} offer more functionality than qt's image stuff but i may be wrong there.