If the image is nonuniformly bright because of off-center lighting, vignetting, etc., it can often be corrected by automatically fitting a function to either the Brightest or Darkest features present in the image, assuming that they are well distributed across the image area, and actually should all have the same brightness.

The Manual method allows customized adjustment of the individual red, green and blue color channels.

The Automatic method makes a neutral color assumption, which is often appropriate for real world images but may not be for images from stained tissue in a microscope, etc. This is obviously not important if you are working with black and white images, or if the actual colors in the image are not important and it is only color differences that matter, for example to differentiate structures for later measurement. All of these routines first create a new layer containing the current image and operate on that layer, preserving whatever has been done previously. In many cases, the fully automatic options can be used, but manual functions that allow for interactive adjustment of parameters are also provided. In most applications, only a few of these will be required. The Adjust Image Panel has 14 buttons, corresponding to 7 types of operations. This may also be a useful learning tool for those who wish to examine the various functions in more detail, but to use them it is only necessary to click on the buttons in the panel. In this initial offering, three panels have been created that should address a great many of the situations that typical users of Photoshop and Fovea Pro encounter, particularly beginning users.

Those individual functions are still accessible in the usual ways, but the panel collects them together and provides a logical arrangement that can be especially useful for those who are not intimately familiar with the many capabilities that Photoshop offers. They make it possible to provide a high-level organization and automation that pulls together a variety of functions normally found in many different menus, including plugins.

Panels are a new feature in Adobe Photoshop CS4.

Create buttons in photoshop cs4