image processing
so I have some images(BMP format) where there are some numbers. I want to change the numbers' colour. the problem is that I can't understand how this thing works. I've searched on the internet and found a function GetPixel (int x, int y) that is supposed to help me change the pixel's colour, but I don't understand how it works because when I try to use it..it isn ' recognized. can someone please help me understand how can I change a pixel's colour?
GetPixel() is a function for Windows only. Do you have Windows? Have you created a window for your program? Have you taken the hDC (Device Context handler) of that window correctly?
Devoted my life to programming...
It's pretty easy to process the bmp file directly if you want.
Ordinary language is totally unsuited for expressing what physics really asserts.
Only mathematics can say as little as the physicist means to say. - Bertrand Russell
I second john.c's suggestion. You might consider reading up on the BMP file format and creating your own small library to manipulate the images however you'd like.
To use GetPixel you need to have a handle to a device context. Before you can create one you need a handle to a bitmap. Finally you nee to find a way the save the modified bitmap. I would say it's too complicated if you have never used the Windows API.found a function GetPixel (int x, int y) that is supposed to help me change the pixel's colour, but I don't understand how it works because when I try to use it..it isn ' recognized
Do you have to do it in C ?
In C++ you could use CImg library. The CImg Library - C++ Template Image Processing Toolkit
yes, i have to do it in C and not using Windows API, but Linux
