Hi Res pdfs from Quark - resolution changing...help!

[johnboyuk@adobeforums.com]

Hi

I'm making hi-res pdfs from Quark by printing as a postcript file then running this through 'Press' settings in distiller. However, if I open the images from the resulting PDF in photoshop it tells me that they are around 200dpi rather than the 300dpi they were originally - whats happening, please help!

Thanks

J

[Jon_Bessant@adobeforums.com]

see reply in your first post

Jon

[MarkATS@adobeforums.com]

However, if I open the images from the resulting PDF in photoshop




How and why are you doing it that way? Use the Preflight tool in Acrobat Pro instead.

[johnboyuk@adobeforums.com]

The images are TIFFS. Im using the adobe pdf ppd.

They arent at 100% in Quark which is what I thought may cause the problem - an enlarged image might show as a lower resolution, I could understand that, however even the images that are reduced in Quark are showing as a lower resolution.

I'm checking them in photoshop as that is what the magazine who are running the add did. If I preflight in acrobat i still get odd numbers (however they show as PPI rather than DPI which is even more confusing!)

ps sorry for the double post... figured this one was a more useful subject heading!

[Jon_Bessant@adobeforums.com]

... what is the line frequency value in the OUTPUT section on Quark when
you made the postscript file?


Jon

[johnboyuk@adobeforums.com]

100lpi (1200dpi for the resolution)

[johnboyuk@adobeforums.com]

looking at my images sizes, one is at 145% in Quark, and is showing as 206.9dpi in the PDF which kind of makes sense - 145% of 206 is about 300. The other image is at 50% though and is showing as 200dpi in the pdf... which doesn't make sense..!?

[johnboyuk@adobeforums.com]

ok.. just set the reduced image to 100%, and low and behold it comes out in the PDF at 300dpi... so why on earth is it reducing the dpi when its set at 50% - you would have thought the dpi should have gone up to 450 using that logic...

this would be a complete pain if i have to resize all images before putting them into Quark....!

[Jon_Bessant@adobeforums.com]

OK - as a test, please set the lpi to 175 and then re-make the PDF with
reduced/enlarged images as before.

Jon

[johnboyuk@adobeforums.com]

Ok.. coming back to this issue! I still havent solved it. I have found that if I use eps as the image type it works fine, so it seems to be a problem with TIFFs - I need to use tiffs though as I often colour up black and white ones in quark...

j

[peter kleinheider]

Hi johnboyuk

XPress has the ability of downsampling images to the desired resolution based on the lpi/dpi settings. To avoid this you have to select the option "Full resolution TIFF output" (or something similar - I have a German version here)

rgds

Peter

[Jon_Bessant@adobeforums.com]

Yes - As Peter noted, TIFFs will typically output at a maximum of double
the LPI resolution under the OUTPUT tab. If you set this to 175 and
ensure the FULL RESOLUTION TIFF OUTPUT is also selected in the OPTIONS
tab - you're there ...

Jo

[johnboyuk@adobeforums.com]

Great, I'll give that a go thanks.