[reportlab-users] How can I insert CMYK JPG in CMYK pdfdocument ?

[Brower Jason]

As far as I know yes, there is such a thing as cmyk jpeg.  At least I have done the conversions.  You can use imagemagick with adobe's provided tools to make the conversions in imagemagick and linux.
But I could be wrong, I am too busy to google today.
Regards,
JAson

-----Original Message-----
From: reportlab-users-bounces at reportlab.com [mailto:reportlab-users-bounces at reportlab.com] On Behalf Of Chuck Martin
Sent: 27/07/2009 16:36
To: Support list for users of Reportlab software
Subject: Re: [reportlab-users] How can I insert CMYK JPG in CMYK pdfdocument ?

I believe that jpg does not support cmyk. When I want CMYK I use tif. 

Since there is no perfect mapping from RGB to CMYK, my images start out as eps with CMYK colors. Then I use ghostscript to convert them to tif. If your images start out as RGB bitmaps, then there is less benefit in converting them to tif.

Chuck


----- Original Message ----
From: KLEIN Stéphane <stephane at harobed.org>
To: reportlab-users at reportlab.com
Sent: Monday, July 27, 2009 8:16:03 AM
Subject: Re: [reportlab-users] How can I insert CMYK JPG in CMYK pdf document ?

Le Mon, 20 Jul 2009 12:33:07 +0000, KLEIN Stéphane a écrit :


> Hi,

> 

> I produce CMYK PDF document and I need to insert CMYK JPG file in my

> document.

> 

> I've one simple example :

> 

> ::

> 

>     from reportlab.pdfgen import canvas

>     from reportlab.lib.units import cm, mm from reportlab.lib.pagesizes

>     import A4 from reportlab.pdfgen.pdfimages import PDFImage

> 

>     c = canvas.Canvas( "test.pdf", pagesize = A4) c.drawString(200, 100,

>     "hello.pdf")

> 

>     img = PDFImage("image_test_cmjn.jpg", 100, 500, 300, 300)

>     img.drawInlineImage(c, preserveAspectRatio = True)

> 

>     c.showPage()

>     c.save()

> 

> "image_test_cmjn.jpg" is a CMYK image. When I look test.pdf, this image

> appear converted in RGB.

> 

> How can I fix this issue ?


I fixed my issue with :

$ convert myfile.jpg -resize 100% myfile.jpg

The "convert" is imagemagick utils.

I don't understand why this fix my issue, maybe error in my jpg...

Regards,
Stephane


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