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// Graphics Code

Real-time Image Levels (input/output/midtone) in VB6

December 24, 2008

This is the first of its kind in VB: accurate, real-time image level adjustment (something familiar to regular GIMP/PhotoShop users). Image Levels provide better control over an image’s luminance than strict brightness/contrast methods, but not quite as much control as a well-built Curves Dialog. Adjusting an image with input/output/midtone levels is primarily designed to brighten or darken an image without losing detail at either end of the luminance spectrum. I’ve included simple histogram drawing code (as the screenshot shows) so you can see the effect that adjusting levels has on an image’s histogram. The code is well-commented and fast – please post comments and enjoy!