RGB curves is a newly added ReaConverter image and photo color correction tool based on editing each color channel (Red, Green, Blue) separately, or all channels (including alpha channel) at a time by adjusting RGBA. RGB curves wizard is available in ReaConverter Standard and Pro, and is primarily intended for advanced and professional photo color editing.

The tool basically affects photo color and brightness. So, even with the basic understanding of the color channels you can adjust or improve your pictures to a certain extent, say, lighten those that are a way too dark, and, conversely, make too bright pictures darker.

With the profound knowledge of photo color correction and some experience in the field of digital photo enhancement, your capabilities to achieve greater quality of pictures become virtually boundless. You can use RGB curves wizard to correct color on photos and images, adjust their brightness and contrast, make tone corrections, remove unwanted color cast, change color temperature, change one color with another, achieve some desired color effects, and much more.

ReaConverter RGB curves is put in the form of a wizard that leads you through the sequence of the interactive steps when you open the pictures, add or remove them (if needed), perform color correction and save the changes, all in a Windows Explorer-like way. The tool works in semi-automatic mode, meaning that it allows to open a batch of images and photos and then process them one by one. Selecting a picture to process is fairly simple with the use of the wizard, and it is the step of photo color editing that should be paid more attention to.

Image and photo color correction by means of RGB curves wizard is achieved by the curve adjustments in a curve dialog box. You can preview the changes on your pictures when the curve is modified.

In its default state the curve is a diagonal straight line with a node (point) in the center. Changing the shape of the curve and position of the node brings changes to pictures sufficient for dealing with many color problems. If you would like to perform more adjustments or add some color effects to your pictures, you can create new nodes to the curve and move them as you want.

To start with color correction and editing, you need to decide what you want to do with a picture and select a color channel to edit in the right upper corner of the RGB curves window. You can edit each channel (Red, Green, Blue, Alpha) separately or all color channels (RGBA) at once. Adjusting these channels basically means changing intensity values of a pixel color component (Red, Green, Blue, Alpha) from 0 to 255.

Just a few examples of what can be done with RGB Curves wizard:

With RGBA selected, modifying the shape of the curve causes changes in all channels. For example, with the curve bent upwards, colors become brighter, which makes the whole picture brighter.

If you just need to control the amount of red, select Red color channel. In this case, the curve adjustments will change intensity of red component of the color only. This can be also applied to transparency, green and blue colors.

If you need to change the color temperature, select Blue color channel, and change blue color intensity by dragging the curve downwards.

Note that you can save your color editing settings and load them whenever such need arises.

To apply color adjustments to an image or a photo, click the 'Save as' button. RGB curves supports the following write graphics formats. If you also need to adjust a picture format settings, note that RGB Curves wizard does that too.