Adobe Photoshop Section Most of the images and graphs at AIM are done using Photoshop. It is a very good image editing application but it has some very nasty properties that degrade the image quality. In this section I explain some of these these unwanted bug like features. Please choose pages of interest from the content list on the left.

In addition the Photoshop RGB calibration page gives in-depth instruction for calibrating Photoshop and the monitor very accurately.

Photoshop also fails to provide an accurate gamma control dialog with what one could change the image-gamma or the file-gamma. You can see a demonstration about this on the opening page of the gamma errors gallyry. This is incomprehensible but it is so, all the rest of the image editing applications do provide the gamma control. Since I do not want to toggle to an other application just for image-gamma changes I wrote accurate gamma map files using the Visual Basic in Excel. These amp files can be loaded into the Curves dialog in Photoshop and they provide accurate gamma function both in the 8-bit and in the 15-bit mode. The inverse gamma n.nn.amp files are as their name says "up-gamma" or 1/gamma, the gamma n.nn.amp files applies the gamma normally. There are 422 files in the zip archive from gamma 1.0 to 3.10 and their inverses, by 0.01 step.

I have written some free FilterFormula/ATS filters they are available for download on the plug-ins page. They should work with other Adobe plug-in compatible applications also but I have not tested them in any other application than Photoshop.