Legacy ImageMagick Discussions Archive

Hello
Hey I was wondering if anyone could help me with this problem.

Basically I have to measure the space between text lines.

Example image: I have to calculate the y-coordinates of the (virtual) red rectangles (right image).
The background is always transparent; the text color is always black (left image).

No matter if two lines character can collapse

For drawing up this text I use the `caption:` feature.

I know that `--debug annotate` can returns some glyph metrics, but this option cannot supply me the values to get the rid.

Thanks in advance!

Please always provide your ImageMagick version and platform when asking questions on this forum.

You can average your image to one column and threshold. Then convert to txt: format and look for the lengths of the white regions

Input:

Since your image has red in it, I have to first remove your red.

Code: Select all

convert lines.png -fuzz 50% -fill white -opaque red -auto-level -negate -threshold 20% -negate lines1.png

Now, scale to 1 column and threshold to black and white

Code: Select all

convert lines1.png -scale 1x! -auto-level -negate -threshold 0 -negate lines2.png

Now convert to txt: format and analyze the stretches of white, i.e. gray(255) as white vs gray(0) as black

Code: Select all

convert lines2.png txt:

Code: Select all

# ImageMagick pixel enumeration: 1,299,65535,gray
0,0: (65535,65535,65535)  #FFFFFF  gray(255)
0,1: (65535,65535,65535)  #FFFFFF  gray(255)
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0,3: (65535,65535,65535)  #FFFFFF  gray(255)
0,4: (65535,65535,65535)  #FFFFFF  gray(255)
0,5: (65535,65535,65535)  #FFFFFF  gray(255)
0,6: (65535,65535,65535)  #FFFFFF  gray(255)
0,7: (65535,65535,65535)  #FFFFFF  gray(255)
0,8: (65535,65535,65535)  #FFFFFF  gray(255)
0,9: (65535,65535,65535)  #FFFFFF  gray(255)
0,10: (65535,65535,65535)  #FFFFFF  gray(255)
0,11: (65535,65535,65535)  #FFFFFF  gray(255)
0,12: (65535,65535,65535)  #FFFFFF  gray(255)
0,13: (65535,65535,65535)  #FFFFFF  gray(255)
0,14: (65535,65535,65535)  #FFFFFF  gray(255)
0,15: (65535,65535,65535)  #FFFFFF  gray(255)
0,16: (65535,65535,65535)  #FFFFFF  gray(255)
0,17: (65535,65535,65535)  #FFFFFF  gray(255)
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0,267: (65535,65535,65535)  #FFFFFF  gray(255)
0,268: (65535,65535,65535)  #FFFFFF  gray(255)
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0,271: (65535,65535,65535)  #FFFFFF  gray(255)
0,272: (65535,65535,65535)  #FFFFFF  gray(255)
0,273: (65535,65535,65535)  #FFFFFF  gray(255)
0,274: (65535,65535,65535)  #FFFFFF  gray(255)
0,275: (65535,65535,65535)  #FFFFFF  gray(255)
0,276: (65535,65535,65535)  #FFFFFF  gray(255)
0,277: (65535,65535,65535)  #FFFFFF  gray(255)
0,278: (65535,65535,65535)  #FFFFFF  gray(255)
0,279: (65535,65535,65535)  #FFFFFF  gray(255)
0,280: (65535,65535,65535)  #FFFFFF  gray(255)
0,281: (65535,65535,65535)  #FFFFFF  gray(255)
0,282: (65535,65535,65535)  #FFFFFF  gray(255)
0,283: (65535,65535,65535)  #FFFFFF  gray(255)
0,284: (65535,65535,65535)  #FFFFFF  gray(255)
0,285: (65535,65535,65535)  #FFFFFF  gray(255)
0,286: (65535,65535,65535)  #FFFFFF  gray(255)
0,287: (65535,65535,65535)  #FFFFFF  gray(255)
0,288: (65535,65535,65535)  #FFFFFF  gray(255)
0,289: (65535,65535,65535)  #FFFFFF  gray(255)
0,290: (65535,65535,65535)  #FFFFFF  gray(255)
0,291: (65535,65535,65535)  #FFFFFF  gray(255)
0,292: (65535,65535,65535)  #FFFFFF  gray(255)
0,293: (65535,65535,65535)  #FFFFFF  gray(255)
0,294: (65535,65535,65535)  #FFFFFF  gray(255)
0,295: (65535,65535,65535)  #FFFFFF  gray(255)
0,296: (65535,65535,65535)  #FFFFFF  gray(255)
0,297: (65535,65535,65535)  #FFFFFF  gray(255)
0,298: (65535,65535,65535)  #FFFFFF  gray(255)

You will have to do some scripting to get the heights of the white gaps.

Thank you very much it. Scaling to 1x solves my headaches.

Great

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