Cropping

http://carol.gimp.org/gimp2/basics/gimplite/crop.html

1 – click the ‘exacto-knife’ symbol in the middle of the tool palette
2 – click in one corner where crop is to begin
3 – click in OPPOSITE corner where crop is to end
4 – clilck once in the middle, everything else is ‘cropped’ !

Scale image

http://www.freesoftwaremagazine.com/articles/digital_image_resizing_gimp

1 – image—>ScaleImage
2 – select new size
3 – hit the ‘scale’ button

Make background transparent

http://www.gimp.org/tutorials/Changing_Background_Color_2/

1 – select the “Select By Color Tool” and click the background color (Select By Color Tool is the fifth one on top row, or Select——>ByColor or SHIFT-O
2 – Layer—>Transparency—>AddAlphaChannel
3 – Edit—>Clear (or delete key)

to DELESELECT part of what was selected (thank you brad)

2008-11-27

1) using either the square, the oval, or the lasso, hold down the CTRL key and circle whatever you want unselected. this will UNSELECT whatever was selected previously.

Chance a particular color

http://www.youtube.com/watch?v=irb4XpLLAPg

1 – select the ‘path tool’ from the tool palette
2 – (optional) zoom in (view—>zoom)
3 – trace out the part of the picture you want to re-color
4 – select—>fromPath (or control-v)
5 – color—>colorBalance and/or color—>colorize
6 – ok button

Expanding the canvas size

note that when you expand a JPEG, transparent background does not work, this only works on PNG files.

1 – Image—>CanvasSize
2 – if expanding a JPG, change “layers resize layers” to “all layers” at the bottom of the screen
3 – if you are only making the image wider rather than taller, click the chain-link image to ‘unlink’ the two, otherwise gimp will maintain the aspect ratio
2008-10-25

Analyze a very specific color

1) click the eyedrop tool to select the correct pixel
2) click the :foreground/background colors selector” (largest symbol)
3) note the numbers – they can be entered into JustButtons tool
2008-10-31

Gradiants

2008-11-27
1) select foreground and background colors using the foreground/background tool
2) click the gradiant tool
3) FIRST click will be the source of the foreground color, drag, LAST CLICK will be the color of the background

Stamp tool (cloning)

2008-11-27
1) pick area
2) hold control and click area to initiate cloning
3) paint: click-drag to paint!

blend tool foreground to transparent

2009-05-13

1) create an image with a WHITE background
2) Layer—>mask—>addLayerMask
3) select White (full opacity)
—-and for images with transparent backgrounds—-
1) Layer—>mask—>addLayerMask
3) Transfer layer’s alpha channel and hit Add
4) blend away!