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You define a dictionary type directly inside the plugin script stating the layers and the area of the image you want to cropp, and you can give a resize factor (variable newsize) for the whole image. You can choose between opening all created cropped images in gimp or saving them.
Just edit the default images dictionary to your needs or test the script on the example xcf file available at
http://freshflesh.de/files/croppparkour.zip
You should have some basic python knowledge to use this script!
Creates a new layer with a grid, rotated 45 degrees, to help you choose corners for cropping.
Move the grid until a line intersects a feature in your image, then crop so that the grid line meets a corner of your cropping rectangle. You can then use the grid to choose the opposite corner, but make sure you don't change either of the sides of your original corner.
Installs in FX-Foundry/Toolbox/Grids/Diagonal Grid
FX-Foundry/Color/Separate Luminance...
Creates two new layers: one containing the Luminance, and the other the Chroma information in the form of a Grain Merge. Optionally, it will color-enhance (maximize saturation in) the Chroma layer while still keeping it luminance-neutral.
This allows you to do noise-reduction and sharpening on the two layers separately.
Update (23-Jul-2009):
Noticed that highly-saturated colors exceed the ability of the grain-extract/grain-merge to handle without clipping the color, so I have made the excess color get folded into the luminance layer. read more »
FX-Foundry/Photo/Enhancement/Maximize Local Contrast... Like Stretch Contrast, but instead of using the minimum and maximum pixel values from the entire image, uses the minimum and maximum in the vicinity of a pixel to compute its new value. Takes a while to run, but really brings out textures. Result is a Grain Merge layer that adjusts values of the original image.
This filter operates on the visible image, not on a layer or selection. read more »
L*C*h (L*a*b* in polar coordinates) color selector module.
Just type "make install" to install this module (You don't need to rebuild the GIMP.) .

It generates a ruler to embed into geographical maps. It allows to customize scale, colors and other things.
The main options are: Step(px) and Step(unit). They define the scale of the rule. Each "px" a step is drawn, representing "unit" kilometers, miles or meters, etc.
See the Screenshots
Round photo edges and apply a shadow border, i.e., 'raise the photo'
This script pops up a GUI which allows you to save your selection to various places
The source is your current selection (or whole image if none) applied to one of:
- the current layer
- all visible layers
- all layers
The destination is one of:
- a PNG file (saved directly to disk)
- a new image in GIMP
- a new layer in the current image
This is a very simple script that adds the rule of thirds guides to the current image.
I used to add guide by guide by percent, then crop, remove the guides and add them again one by one. read more »
Add a grid of guides from number of horizontal and vertical parts in GIMP.
Tested with GIMP 2.6