mrwul wrote:Maybe it is totally impossible what I am trying to accomplish...
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One way -- and I suspect probably the only way -- to get somewhere close to what you want would be to use the Image > Canvas size... function, but it would require repeated operations with different settings, and there would be some limitations on what could be achieved.
The basic method would be to set the 'Screen Size' values to '%' in the drop down menu, uncheck 'Keep ratio', then set the 'Width' to 100% and the 'Height' to a smaller percentage -- as the 'Image position' for the crop can only be set to three positions vertically, that would probably be 33,3% initially.
Making three successive resizes of the original image using 'Image positions' of 'Top-Center', 'Center' and 'Bottom-Center' would split the image into 3 as a first step, and the procedure could then be repeated on each resulting image to obtain a total of 9 divisions of the original long image.
Alternatively, 'Heights' of 50% could be used to split the original image into two equal halves successively using 'Image positions' of 'Top-Center' and 'Bottom-Center', enabling division into 2, 4, 8 or 16 equal images.
Some experimentation might be required to obtain the desired result, and it would be important to uses copies of the original image to void losing the originals. I should add that I haven't tried the full method!
Although the above procedure may be impractically lengthy, if it were required regulalry it could probably be implemented using the command line NConvert repeatedly in a batch file.
Note:
This is is actually another request -- although an unusual one -- for a 'Split' function which is made periodically but isn't yet supported; if it were provided using a general algorithm to divide an image into m x n images it would be ideal for this request: m=1, n=9 !).
