Legacy ImageMagick Discussions Archive

Hello.

I'm trying to put some text on a tiff file and it takes around 5-6 seconds. Is there a way to speed up the process?
I execute the next command:

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convert aaa.tif -font Arial -pointsize 100 -gravity West -draw "text 0,0 'hola'" -monitor -compress Group4 -define quantum:polarity=min-is-white stamp.tif

I use the -monitor swith so I can see that it takes more time in Dither image colors: process. Is there anyway of disable dithering? I've tried +dither but it takes the same time.

The input tiff file is like this:

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/opt/imagemagick/bin/identify -verbose aaa.tif
Image: aaa.tif
  Format: TIFF (Tagged Image File Format)
  Class: DirectClass
  Geometry: 2479x3508+0+0
  Resolution: 300x300
  Print size: 8.26333x11.6933
  Units: PixelsPerInch
  Type: Bilevel
  Base type: Bilevel
  Endianess: LSB
  Colorspace: RGB
  Depth: 1-bit
  Channel depth:
    gray: 1-bit
  Channel statistics:
    gray:
      min: 0 (0)
      max: 1 (1)
      mean: 0.763653 (0.763653)
      standard deviation: 0.424837 (0.424837)
      kurtosis: -0.45943
      skewness: -1.2412
  Histogram:
   6640984: (255,255,255) #FFFFFF white
   2055348: (  0,  0,  0) #000000 black
  Rendering intent: Undefined
  Interlace: None
  Background color: white
  Border color: rgb(223,223,223)
  Matte color: grey74
  Transparent color: black
  Page geometry: 2479x3508+0+0
  Dispose: Undefined
  Iterations: 0
  Compression: Group4
  Orientation: TopLeft
  Properties:
    create-date: 2009-04-08T16:55:47+02:00
    modify-date: 2009-04-08T16:55:47+02:00
    signature: 3d9f8b09ba3d3deb80b5d89ed0960e89474030b7c22fba854ea9428ce29f1a03
    tiff:document: 0000000001.tif
    tiff:rows-per-strip: 3508
    tiff:software: ImageMagick 6.5.1-0 2009-04-06 Q16 http://www.imagemagick.org
    tiff:timestamp: 2009:01:21 10:56:40
  Artifacts:
    verbose: true
  Tainted: False
  Filesize: 509kb
  Number pixels: 8.293mb
  Version: ImageMagick 6.5.1-0 2009-04-06 Q16 http://www.imagemagick.org

I've compiled ImageMagick 6.5.1-0 version.

Thanks in advance.

Anybody?

ImageMagick is not optimized for processing 1-bit images. Text annotation adds shading to your image so it must be color reduced afterwards to recreate a monochome image. Color reduction is rather slow in ImageMagick. You can try thresholding which is quite fast but it may not return the results you are looking for.

ordered dithing is also faster than the normal color reduction processing.

Hi and thank you very much for your answers.
Adding the option -threshold 50% the process is much faster.
Without thresholding:

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time /opt/imagemagick/bin/convert aaa.tif -font Arial -pointsize 100 -gravity West -draw "text 0,0 'hola'" -compress Group4 -define quantum:polarity=min-is-white stamp.tif

real    0m5.506s
user    0m4.944s
sys     0m0.552s

With thresholding:

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time /opt/imagemagick/bin/convert aaa.tif -font Arial -pointsize 100 -gravity West -draw "text 0,0 'hola'" -compress Group4 -define quantum:polarity=min-is-white -threshold 50% stamp.tif

real    0m0.579s
user    0m0.224s
sys     0m0.348s

Almost ten times faster.

The result image is quite good and is enough for me at the moment.

Legacy ImageMagick Discussions Archive

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