Legacy ImageMagick Discussions Archive

Hello.

I have this images and many more like it: https://docs.google.com/file/d/0B5ZUp1_g7uQlZVBKMjRBeDh2X2c/edit
What I want to achieve is getting all black areas transparent and all "shaded" areas (ie: the part behind the trees) either also transparent or ideally semi-transparent
Currently I use ...

snibgo wrote:The sequence ...

Code: Select all

-resize 50% -write mpr:output \) \
\( mpr:output -crop 256x256

... can be replaced with ...

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-resize 50% -crop 256x256

But only for the last one, right? Or is it automatically written back to mpr:output?

Yes, that's it. However, you don't have a final output file, so you should add "NULL:" to the end. Alternatively, change your last line to remove the parentheses and "-write".

After your resize, you are writing the mpr then immediately reading it again. This is superfluous.

Ah, yes, I forgot to ...

The basic syntax of the convert command is:
convert {input_file} {processing} {output_file}
If you want to write in other places, you need the "-write" command. As you did for the mpr outputs.

Not sure if you meant to say this, but with this hint I managed to get it working like this:
convert ...

I'm running this on Ubuntu 12.04 with IM 6.6.9-7 2013-06-09 Q8

Maybe I asked it to read it, but I did not mean to do that. I meant for convert to write cropped tiles of 256x256 px to 0_0.jpg 0_1.jpg etc. Like it would with:
convert -monitor ../output.jpg -crop 256x256 -set filename:tile "%[fx:page ...

Hello.

I have another question about using a single command for multiple operations:
I want to crop an image into tiles, then resize that image, then crop the result again. Right now I have this code:

convert -monitor ../output.jpg \
-write mpr:output \
\( mpr:output -crop 256x256 -set filename ...

I understand, thank you for the answer!

Hello.

I'm stitching together a map from many many screenshots of a video game.
My machine specs: Intel i7M Quad-Core @ 2.90GHz - 16 GB RAM - 500 GB SSD Harddisk - Ubuntu 12.04
My MAGICK environment: MAGICK_MEMORY_LIMIT=12G MAGICK_TEMPORARY_PATH=.
My imagemagick version:

$ identify -version ...