RE: [iText-questions] Adding Images as Transparent

[Criddle, Daniel]

Title: RE: [iText-questions] Adding Images as Transparent

Thanks for your reply.  I am amazed and impressed by your personal attention to this free product.

 

For other iText users' info, the arguments into the setTransparency must be pairs of integers representing the range of colours you want made transparent  (eg, new int[] {min, max, min, max, min, max})..  So in a 8-bit, 1-colour colourspace (ie. black and white), putting in { 255, 255 } will make every white pixel transparent, while {127, 255} will make all the medium to white pixels transparent.  In an 8-bit RGB colourspace, {255, 255, 255, 255, 255, 255} will set all the white pixels transparent.  Please not I haven't fully tested this, but its how I believe it works.

 

A useful page on colour space and different file types is:

http://www.visionary-voyager.com.au/corel/photopaint/web_works/glossary_b.htm

 

Regards,

 

Dan Criddle

-----Original Message-----
From: Paulo Soares [mailto:[EMAIL PROTECTED]
Sent: 15 December 2003 12:08
To: Criddle, Daniel; [EMAIL PROTECTED]
Subject: RE: [iText-questions] Adding Images as Transparent

See page 277 in the PDF reference 1.4.

Best Regards,
Paulo Soares

-----Original Message-----
From:   [EMAIL PROTECTED] [SMTP:[EMAIL PROTECTED] On Behalf Of Criddle, Daniel

Sent:   Monday, December 15, 2003 11:06
To:     '[EMAIL PROTECTED]'
Subject:        [iText-questions] Adding Images as Transparent

Does anyone know where I can find documentation for the method
Image.setTransparency(new int[]) - I want to know what different values in
the int[] would mean.

I am currently using the method to make the white background of images
transparent before I add them to the document.  The following normally
works: Image.setTransparency(new int[] { 255, 255 }); but I don't know why,
and it doesn't all the time!

Thanks in advance,

Dan Criddle




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