Category: Graphics Code · Originally posted December 24, 2008 · Last updated February 1, 2011

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

This is the first of its kind in VB: accurate, real-time image level adjustment. 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 image 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!

The included histogram code is also quite good.

download Real-Time Image Levels (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.