pixel editing in an image

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I'm looking for the C++ version of the getpixel/setpixel functions of VB. I have a program in VB that's way too slow, so I'm trying to translate it into VC++. Basically it runs algorithms that edit an image pixel by pixel. It works fine in VB, but slow as mud.

So a) how do you access the rbg values of a selected pixel in a loaded image in Vc++, and b) how do you change them once you have the info?

Thanks in advance.

Posted 29-Sep-11 13:02pm

Kevnar

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Sergey Alexandrovich Kryukov 29-Sep-11 20:09pm

Windows? Tag it.
--SA

3 solutions

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Sergey Alexandrovich Kryukov · Answer 1 · 2011-09-29T14:13:00

Solution 2

How many pixels you want to access? 5, 15? :-)

If you want to process a whole picture or a big part of them, forget GetPixel/SetPixel — this is too slow.
For a better approach, check out this CodeProject article: A fast way to work on Windows bitmap pixel data without using the slow GetPixel and SetPixel methods[^].

See also another article — a tutorial: Bitmap Basics - A GDI tutorial[^].

—SA

Posted 29-Sep-11 14:13pm

Sergey Alexandrovich Kryukov

Updated 29-Sep-11 14:14pm

v2

Comments

Espen Harlinn 29-Sep-11 21:23pm

Good points :)

Sergey Alexandrovich Kryukov 30-Sep-11 0:23am

Thank you, Espen.
--SA

Abhinav S 1-Oct-11 5:40am

Good answer. 5.

Sergey Alexandrovich Kryukov 1-Oct-11 9:07am

Thank you, Abhinav.
--SA

Espen Harlinn · Answer 2 · 2011-09-29T15:22:00

Solution 3

You could take a look at the Anti-Grain Geometry Project[^]

It's quite good :)

Best regards
Espen Harlinn

Posted 29-Sep-11 15:22pm

Espen Harlinn

Comments

Abhinav S 1-Oct-11 5:40am

Gives an alternate to the OP. 5.

Espen Harlinn 1-Oct-11 6:12am

Thank you, Abhinav! AGG is really quite nice ...

barneyman · Answer 3 · 2011-09-29T13:35:00

Solution 1

have a look at The Bitmap Functions[^], specifically SetPixel

Posted 29-Sep-11 13:35pm

barneyman