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PDF to TIF (with some peculiarity)
Posted: 2014-06-27T11:37:27-07:00
by myspacee
Hello,
in my job Production, in some circumstances, it happens that pdf materials are transformed into TIF using Ad0be suite.
I post starting example :
http://static.repubblica.it/laprovincia ... o/AMEL.pdf
and its TIF trasformation :
http://static.repubblica.it/laprovincia ... o/AMEL.tif
Ask typography guys and tell me that set DPI to 300, and use LZW\CMYK compression to obtain TIF
Can suggest me how get the result as close as possible to the posted example ?
(above AMEL.tif)
thank you for any info,
m.
Re: PDF to TIF (with some peculiarity)
Posted: 2014-06-27T11:49:25-07:00
by fmw42
try
Code: Select all
convert -density 300 -colorspace CMYK AMEL.pdf -compress lzw AMEL_im.tif
or perhaps slightly closer
Code: Select all
convert -density 300 -colorspace sRGB AMEL.pdf -profile /Users/fred/images/profiles/sRGB.icc -profile /Users/fred/images/profiles/USWebCoatedSWOP.icc -compress lzw AMEL_im2.tif
Re: PDF to TIF (with some peculiarity)
Posted: 2014-06-27T12:06:23-07:00
by myspacee
Thank you for reply,
but I post after try command like your. IM file is bigger in size but worst visually.
In IM file letters are 'pixelated' (less defined details).
if increase geometry or density i obtain a file more bigger than example, can't solve 'mystery'...
m.
EDIT: can't see last command, try now!
Re: PDF to TIF (with some peculiarity)
Posted: 2014-06-27T12:13:57-07:00
by fmw42
myspacee wrote:Thank you for reply,
but I post after try command like your. IM file is bigger in size but worst visually.
In IM file letters are 'pixelated' (less defined details).
if increase geometry or density i obtain a file more bigger than example, can't solve 'mystery'...
m.
EDIT: can't see last command, try now!
To get the better text resolution try the following (supersampling method)
Code: Select all
convert -density 1200 -colorspace CMYK AMEL.pdf -resize 1042x1067 \
-depth 8 -density 300 -units pixelsperinch -compress lzw AMEL_im4.tif
Or (
use your own paths to your profiles in the following)
Code: Select all
convert -density 1200 -colorspace sRGB AMEL.pdf -resize 1042x1067 \
-profile /Users/fred/images/profiles/sRGB.icc -profile \
/Users/fred/images/profiles/USWebCoatedSWOP.icc \
-depth 8 -density 300 -units pixelsperinch -compress lzw AMEL_im5.tif
The colors on this actually match closer to your pdf than your tif does.
On Windows use ^ rather than \ for new line
Re: PDF to TIF (with some peculiarity)
Posted: 2014-06-27T12:50:02-07:00
by myspacee
Best so far :
Code: Select all
convert -density 1200 -colorspace CMYK AMEL.pdf -resize 1042x1067 -profile USWebCoatedSWOP.icc -depth 8 -density 300 -units pixelsperinch -compress lzw AMEL_im6.tif
Choose supersampling method (increase letters 'resolution')
force colorspace to CMYK
using USWebCoatedSWOP.icc (CMYK - from :
http://www.adobe.com/support/downloads/ ... ftpID=3680)
boost unique colors to 221665 (instead of 83363 of first examples)
But original is alway better.
I'm forced to use CMYK to print to my factory rotary press.
I prefer to define letters with major quality. Is there another way instead supersampling ?
thank you for your time,
m.
Re: PDF to TIF (with some peculiarity)
Posted: 2014-06-27T13:21:36-07:00
by fmw42
I prefer to define letters with major quality. Is there another way instead supersampling ?
I am not sure I understand what the remaining issue is? The supersampling should get good quality text.
You can cut the file size way down if you add -type palette. But then the colors will not be a good.
Re: PDF to TIF (with some peculiarity)
Posted: 2014-06-27T13:35:20-07:00
by myspacee
Black is better in my opinion and Ad0be tif had better quality on shapes.
I need to automatize process for emergency cases, but I'm surprised by the differences between yield...
I am accustomed to think IM as a remedy for all ills
Maybe try Ghostscript directly, but think IM use an interpreter to convert PDF/EPS/PS to image format, so i've little hope...
Thank you again,
m.
Re: PDF to TIF (with some peculiarity)
Posted: 2014-06-27T13:48:00-07:00
by fmw42
Photoshop created tiff and so may have better software to convert to tiff. It also has color features that are not available in IM, such as spot colors and may use different profiles. So in general, I would not expect IM to reproduce anything in PS perfectly.