On 4 January 2011 Philip Taylor (Webmaster, Ret'd) wrote:
I am attempting to incorporate
http://thai-an.co.uk/Resources/Graphics/thai-an-logo-no-phone.png
as a background image in PdfTeX, and of course it is far too saturated to use as-is. While I could manipulate it in Photoshop or similar, I wonder if there is a more direct way whereby I can specify (say) its transparency in PdfTeX so as to effectively reduce its saturation ?
Hi Phil, sorry, $ wget http://thai-an.co.uk/Resources/Graphics/thai-an-logo-no-phone.png --2011-01-04 19:37:39-- http://thai-an.co.uk/Resources/Graphics/thai-an-logo-no-phone.png Resolving thai-an.co.uk... 93.97.166.234 Connecting to thai-an.co.uk|93.97.166.234|:80... failed: Connection timed out. Retrying. --2011-01-04 19:40:49-- (try: 2) http://thai-an.co.uk/Resources/Graphics/thai-an-logo-no-phone.png Connecting to thai-an.co.uk|93.97.166.234|:80... failed: No route to host. Same results with http://www.downforeveryoneorjustme.com However, you can probably apply ICC profiles, but this looks non-trivial. The IIC file in the pdftex samplepdf directory is a binary file. Maybe it's possible to apply ICC data in ASCII format, but I just found a simpler solution: sam2p thai-an-logo-no-phone.png thai-an-logo-no-phone.eps In the EPS file, immediately after the lines beginning with %%, add the line { .33 exp } dup dup currenttransfer setcolortransfer and then run epstopdf thai-an-logo-no-phone.eps I get acceptable results with the JPG file I used for testing, but you probably have to experiment with the transfer function. The first occurrence of the function denotes the transfer function for the red part of the image. Because we need the same function for all three colors, we simply duplicate it twice on the stack. Regards, Reinhard -- ---------------------------------------------------------------------------- Reinhard Kotucha Phone: +49-511-3373112 Marschnerstr. 25 D-30167 Hannover mailto:reinhard.kotucha@web.de ---------------------------------------------------------------------------- Microsoft isn't the answer. Microsoft is the question, and the answer is NO. ----------------------------------------------------------------------------