Legacy ImageMagick Discussions Archive

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viewtopic.php?f=1&t=25066&p=108472#p108472

Possibly the colon between tiff and rows-per-strip (tiff:rows-per-strip) may be causing confusion in parsing?

• # convert -size 100x100 xc:white -units PixelsPerInch -define tiff:rows-per-strip=100 -density 400 -depth 8 -type Bilevel -colorspace Gray -compress None outfile.tif
  # tiffinfo outfile.tif | grep Rows
  Rows/Strip: 100
  # identify -verbose outfile.tif | grep rows-per-strip
  tiff:rows-per-strip: 81

It does set Rows/Strip to 100. However, ImageMagick determines the rows-per-strip attribute with the TIFF delegate library call:

• TIFFGetField(tiff,TIFFTAG_ROWSPERSTRIP,&rows_per_strip);

Its returning 81. There may be an internal limit for rows-per-strip in the TIFF delegate library depending on the image dimensions because if you define it to be less than 81, it always returns that value:

• # convert -size 100x100 xc:white -units PixelsPerInch -define tiff:rows-per-strip=80 -density 400 -depth 8 -type Bilevel -colorspace Gray -compress None outfile.tif
  # tiffinfo outfile.tif | grep Rows
  Rows/Strip: 80
  # identify -verbose outfile.tif | grep rows-per-strip
  tiff:rows-per-strip: 80

what about the +define to remove the fields? That does not seem to work.

• what about the +define to remove the fields? That does not seem to work.

Which fields? Some fields are required.

The user wanted to remove the tiff:... fields. Also when I tried +define "*", I got an error message. see the reference in my first post above.