Bad background with new imagemagick
Posted: 2011-03-15T08:20:26-07:00
Hello, I am using imagemagick to convert pdf files to tif and jpeg.
With im6.6.5-0 I do something like and my page with black text on white paper is converted to a tif with black text on white background.
When I do the same with im6.6.8-4 (I think any im > 6.6.7) I get something like black text on black background.
With I get with older im and with new im.
So new im sees a different Image Type.
The pdf file is produced as a CMYK Postscript file which then is distilled by Distiller 8 to RGB pdf.
I tried and this rendered black text on white background.
But how do I do that with Image::Magick?
With im6.6.5-0 I do something like
Code: Select all
convert page.pdf page.tifWhen I do the same with im6.6.8-4 (I think any im > 6.6.7) I get something like black text on black background.
With
Code: Select all
identify -verbose page.pdfCode: Select all
Image: page.pdf
Format: PDF (Portable Document Format)
Class: DirectClass
Geometry: 1117x1597+0+0
Resolution: 72x72
Print size: 15.5139x22.1806
Units: Undefined
Type: TrueColor
Endianess: Undefined
Colorspace: RGB
Depth: 16/8-bit
Channel depth:
red: 8-bit
green: 8-bit
blue: 8-bit
Channel statistics:
...
Artifacts:
verbose: true
Tainted: False
Filesize: 5.352MB
Number pixels: 1.784M
Pixels per second: 111.5M
User time: 0.016u
Elapsed time: 0:01.015
Version: ImageMagick 6.6.5-0 2010-10-10 Q16 http://www.imagemagick.org
Code: Select all
Image: page.pdf
Format: PDF (Portable Document Format)
Class: DirectClass
Geometry: 1117x1597+0+0
Resolution: 72x72
Print size: 15.5139x22.1806
Units: Undefined
Type: TrueColorMatte
Endianess: Undefined
Colorspace: RGB
Depth: 16/8-bit
Channel depth:
red: 8-bit
green: 8-bit
blue: 8-bit
alpha: 8-bit
Channel statistics:
...
Artifacts:
verbose: true
Tainted: False
Filesize: 584KBB
Number pixels: 1.784MB
Pixels per second: 28.32MB
User time: 0.063u
Elapsed time: 0:01.062
Version: ImageMagick 6.6.8-4 2011-03-11 Q16 http://www.imagemagick.org
So new im sees a different Image Type.
The pdf file is produced as a CMYK Postscript file which then is distilled by Distiller 8 to RGB pdf.
I tried
Code: Select all
convert -alpha deactivate page.pdf page.tifBut how do I do that with Image::Magick?