Legacy ImageMagick Discussions Archive

Thanks, interesting idea. Even if it doesn't really solve our problem, I should definitely check out that route!

Ok, here's the result I'm getting: http://users.telenet.be/guy.lateur/IM/OUT3.png

Here's the python script that generates this result:

import subprocess

import BBox # custom Bounding Box class BBox & utilities

filename = "\"" + r"F:\Amiga\_bmp\Fonts\IN3.png" + "\""
fileoutbboxes = "\"" + r"F ...

You can certainly do it more manually. From the white and black image, scale to a single row. PIxels in this Nx1 image that are black are between the characters, so that gives you the left/right boundaries. Then crop the white/black image to those boundaries, and trim gives you the top/bottom ...

You could create an image of each character and use -debug annotate to find the glyph characteristics. See http://www.imagemagick.org/Usage/text/#font_info.

Alternately, you could do the blur and then reduces the bounding box by the blur distance.

Thanks, I'll look into the font info thing. I'm ...

Ah, yes, I remembered about dotted ij etc but then forgot. Just blur vertically, eg with "-morphology Convolve Blur:0x10,90", before changing the colours. But that messes with the top and bottom of the bounding rectangle. Hmm... thinking ...

But surely that will give bounding boxes that are too ...

Thank you both for your suggestions; that's already a very big step in the right direction! :)

Unfortunately, I don't think the 'connected-components' approach is going to take us all the way there. Consider this source font file: http://users.telenet.be/guy.lateur/IM/testFonts-003-cropped.png

If ...

I'm using ImageMagick 7.0.7-35 Q16 x64 2018-05-21 on win7pro.

I'm looking to separate the characters in a 'bitmap-font-file'. Suppose I had a file like this: http://users.telenet.be/guy.lateur/IM/testFonts-002-cropped.png

I want to calculate the bounding rectangles around each character. Let's ...

The extra colormap entry seems to be the background colour (which defaults to white, but can be changed with "-background"). To avoid that being added to the colormap, excluding the PNG background chunk seems to work:

f:\web\im>%IMG7%magick convert IN-colormap17.jpg -colors 16 -background red ...

I suggest you add +dither or -dither none before -colors to avoid getting dithered results.

Thanks for the tip, I'm aware of that switch. I don't think it'll be a question of always having dither on or off. Sometimes (like with a picture) dithering can be beneficial to the overall quality ...

About 1): here's the input: http://users.telenet.be/guy.lateur/IM/IN-colormap17.jpg
Here's the output I get: http://users.telenet.be/guy.lateur/IM/OUT-16-8.png
As mentioned, this is the command that generates that:
magick convert IN-colormap17.jpg -colors 16 -depth 8 OUT-16-8.png

About 2 ...

ImageMagick 7.0.7-35 Q16 x64 2018-05-21, on win10pro.

1) convert IN.jpg -colors 16 -depth 8 OUT.png
The input is a picture of 2 people; nothing special.

2) Ok, I'll look into the remap option, thanks. And about not using all colors: I've had conversions to 16 color palettes (4 bits/channel) that ...

Hi all, new user here, so please bear with me.. ;)

I'm trying to use IM in my 'modern day Amiga workflow'. I'll usually be starting from a high resolution 8bit/channel image that has, say, been rendered in Blender. I'll need to convert this image to a low resolution paletted/color-indexed version ...