Legacy ImageMagick Discussions Archive

Hi All,

Trying to read the result of histogram analysis in python but running into issues based on the stdout formatting.

I run:

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convert pic_4.jpg -colors 256 -depth 8 -format "%c" histogram:info: | head -n 5 >> hist_4.txt

which gives me:

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    705711: ( 37, 42, 35) #252A23 srgb(37,42,35)
    562775: ( 39, 39, 41) #272729 srgb(39,39,41)
    154348: ( 39, 42, 30) #272A1E srgb(39,42,30)
     88998: ( 40, 41, 54) #282936 srgb(40,41,54)
      5824: ( 40, 49,102) #283166 srgb(40,49,102)

I can read this into python using space ( ' ' )

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df = pd.read_table(filename, sep='\s+', header=None)

as a delimiter, however, this leads to issues with the last row where because the blue value (102) has 3 digits instead of 2 (like the rest of the blue values), there isn't a space and this breaks the file read.

Ideally I would like to format the stdout to use comma or tab separated values. OR just strip out the formatting and not add leading spaces in the case of a 1 or 2 digit value.

I've tried searching but only get results showing how to format image outputs, not histogram text stdout.

Thanks in advance!
-Sante

In that location (colour tuples), the reliable separator is a comma, not a space. The format is hard-coded in histogram.c GetNumberColors().

Legacy ImageMagick Discussions Archive

How to change histogram stdout format

How to change histogram stdout format

Re: How to change histogram stdout format