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Message:: [QUOTE="brg5658, post: 1327907, member: 29751"]If you download GIMP, it is quite simple to adjust the white balance in post processing.  BUT, it is far better to adjust your white balance at the photography stage.  I will describe here how you can adjust the WB of your photos using GIMP. 1.  Open your image in GIMP.  It should look something like this:[ATTACH]151560.vB[/ATTACH] 2.  From the Colors Menu, select the option "Levels...".[ATTACH]151561.vB[/ATTACH] 3.  When the Levels window opens, find the "White Balance" eye dropper.  I have highlighted it in pink here so you can see it.  Click on this button.[ATTACH]151562.vB[/ATTACH] 4.  Once you have selected the white point eye dropper, you will drag the eye dropper icon to your picture and find an area that is supposed to be true white.  In the case of your photo, the NGC holder should be white.  I position the eyedropper in the upper left area of the picture over the NGC holder plastic area.[ATTACH]151563.vB[/ATTACH] 5.  One simple slick of your mouse in this area, and you can see how the photo is adjusted for white balance.  Click "OK" in the original Levels window to accept the change of colors.[ATTACH]151559.vB[/ATTACH][/QUOTE]