Category: Graphics Code · Originally posted June 19, 2008 · Last updated February 2, 2011

Real-time Image Contrast in VB6

Here’s the first (and still the best!) VB-based example that demonstrates how to correctly adjust an image’s contrast. I use DIB sections to maximize speed; it’s also worth mentioning that to perfectly determine contrast, you would have to first find the average brightness of the image – I use the shortcut method and assume that the average is 127 (close enough for our purposes).

Many people have used this code in various open-source VB projects, but rest assured: this is the original, most complete, most correct copy.

download Real-Time Contrast (complete source code in VB6 format)

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All source code in the above zip file(s) is released under a BSD License.