Although I don't know how to do this myself, one of the places I've seen it done is in JpGraph (www.aditus.nu).
The function that does it is AdjBackgroundImage($bright, $contrast, $saturation) in jpgraph.php. You could try taking a look at the source? Pete. Dimitar Haralanov wrote: > > Hi, > > I hope this is the right newsgroup for this so if it is not, please, > excuse me. > I would like to be able to change the brightness of an image using PHP. > Here are some more detiails: I would like to load a jpeg file from a > webpage, change the brightness of the image, and save it back to a file. > I am pretty sure how to load and save the file but I can not figure out > how to change the brightness. > I am using PHP 4.1.2. > > Thanx > -- Mitko > > -- > --------------------------------------------------- > To reply remove all CAPS letters from email address > --------------------------------------------------- > The little town that time forgot, > Where all the women are strong, > The men are good-looking, > And the children above-average. > -- Prairie Home Companion > > -- > PHP General Mailing List (http://www.php.net/) > To unsubscribe, visit: http://www.php.net/unsub.php
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