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How about:-
Starting digital photograph processing with GNU/Linux
Precondition
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Importing the image into a computer running Linux from a digital camera,
flatbed or film scanner
Briefly
-------
Scanning prints and slides under Linux
Ways of organising collections of images
The resolution of images on screen and paper
Adjusting Levels, Contrast, Colour, Hue & Saturation
The tools in the Toolbox
In more detail
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Cropping and straightening
Cloning out unwanted pedestrians, wires, etc
The various Selection Tools including the Quick Mask for precise selections
Feathering selections
The key tools in the filters menu:
* Sharpening using the un-sharp mask
* Creating Monochrome images from colour using several techniques
* handling converging verticals
* Re-sizing the image and canvas for final output
* Creating borders, drop shadows and other effects around an image
* Printing images
Gimp doesn't have the Photoshop systems for
* The Healing Tool and the Patch Tool to remove blemishes
* Dust & Scratches
Are they available as plugins though?
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Second Block
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Layers
http://www.thephotographicsociety.com/learn/digital_image_manipulation/introduction_to_layers
etc
Levels, contrast and saturation
Masks
...
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