Legacy ImageMagick Discussions Archive

magick frames.png -crop 216x120 tile%03d.png :info magick: unable to open image 'tile%03d.png': No such file or directory @ error/blob.c/OpenBlob/3497. That command is garbage. Try the commands I showed you. info: frames.png PNG 216x8880 216x120+0+0 8-bit sRGB 3.5611MiB 0.000u 0:00.000 That's the ...

info: frames.png PNG 216x8880 216x120+0+0 8-bit sRGB 3.5611MiB 0.000u 0:00.000

magick frames.png -crop 216x120 tile%03d.png :info
magick: unable to open image 'tile%03d.png': No such file or directory @ error/blob.c/OpenBlob/3497.

The file created is tile000.png it's doing the first 216x120 piece of the image. I get the impression it's just not continuing down the file.

version 7.0.8-68 x64. I'm literally running it at command prompt in Windows 10 but it only seems to produce 1 image and not do the entire image?

I'm using the following command on a 216 x 8880 image

magick convert frames.png -crop 216x120 tiles/tile%04d.png

Unfortunately it only outputs one image at 216x120.

Could someone tell me what I am doing wrong?

Unfortunate! I'll have to script in a second process to do that then. Thanks for the quick reply snibgo.

Is it possible to sort indexed palettes with ImageMagick? I want colour 0 to always be the darkest colour. I can do this in GIMP simply by going from RGB to Indexed.

Hmm. I would guess that you need the same 16 colours in each frame, to avoid flicker. What I've found so far is applying the colormap before doing anything else reduces the flicker considerably. In jobs like this, rather than trying to design the perfect solution, it can be more productive to ...

Then my command will give you up to 512 colours. If you only want 16 colours, your colormap.png needs to contain only 16 colours. I don't know what constraints you have, or how you have chosen the 512 colours. You could remap to those 512 colours, and find the 16 colours that occur most frequently ...

My colourmap contains a 9bit colourmap of 512 possible colours.

Thanks for everyone's help with this btw! Really appreciate it!

Okay half way there

convert ', \\Source\\frame470.png', ' -ordered-dither checks,8,8,8 +write ', \\OrderedDither\\frame470.png', ' +dither -remap colormap.png ', '\\Remap\\frame470.png'

However I'm still missing reducing things to 16 colours.

Thanks I'll post back in the morning

Order-dither is definitely what I'm after but I can't fathom how to restrict it to 16 colours? It looks like you can only restrict to RGB steps?

-ordered-dither checks,8,8,8 is what I have at present but I then have to run a quantize to reduce the colouring but that can't be right surely!

fmw42 wrote: ↑2018-10-03T15:06:00-07:00

mattyrb wrote: ↑2018-10-03T14:59:03-07:00 When I say consistent the dither pattern needs to be consistent obviously error-diffusion is too random

I suspect he means the same unique pattern over the whole image, i.e. an ordered-dither

Yes! Sorry. I'm really new to image processing!