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Author Topic: printer resolution - some tests for you to do  (Read 52950 times)
Terry-M
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« Reply #30 on: March 30, 2010, 09:08:25 PM »

Hi Chas,
I'm not really familiar with CS4/ACR settings but from your screen snap, it does seem that the original image pixel size is being maintained (no re-sizing), ie. 2848x4272 pixels. The 600ppi is, I think, just a tagged value on the image. This, in reality is meaningless, because an IMAGE only has a pixel size, it has no inches so ppi is only relevant to prints.
There is often confusion about this matter so you need to think in Qimage terms for printing, linear dimension for prints.

Your earlier post (reply #21)
talked about
Quote
(interpolated 4800x1200)
so I just want to make sure, the image you use from ACR in Qimage is still 2848x4272 pixels?

Assuming the 600ppi is a tag, IF you used Qimage's "Original size" option, your image would print at 2848/600 x 4272/600 = 4.75" x 7.12". There are a few guys who like to work that way, but it's much easier to use linear (inch) dimensions in Qimage, after all that's what you need to specify for a print size.
In a word, the 600ppi in ACR does not matter, if it's only a tag. (perhaps someone can confirm that)
Accept what Q tells you is the driver's native resolution, (600 for HP & Canon, 720 for Epson), or lower if at a lower than maximum driver quality setting.
I hope we are nearly there now, sorry to go on about this but I had the feeling there was something that was causing confusion - for both of us  Shocked
Terry
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ChasP505
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« Reply #31 on: March 30, 2010, 09:34:29 PM »

I hope we are nearly there now, sorry to go on about this but I had the feeling there was something that was causing confusion - for both of us  Shocked
Terry

No confusion and I do appreciate your time.  I understand that the 600ppi setting I enter is meaningless until/unless I print.  I set that because I still occasionally print from Photoshop and it's just one more step saved, and one more pre-print setting that's easy to forget.

Regarding the 4800x1200 interpolated...  That's an actual print quality setting in most HP photo printers. I didn't mean to imply that I used any software to interpolate to this resolution. Best = 600 dpi, Maximum = 4800x1200 dpi.  I always print with the "Best" setting.  I guess most of the residents of this forum are Epson or Canon users and not familiar with the prosumer level HP printers.

Regarding 16 bit files, of course I knew that Qimage handled any required interpolation automatically, but I thought you guys were telling me I HAD to send Qimage an 8 bit file.  Anyway, I learned something today.   Smiley
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Chas
Terry-M
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« Reply #32 on: March 30, 2010, 09:42:58 PM »

Quote
Maximum = 4800x1200 dpi
This is DPI, the printer nozzle spray pattern number, not to be confused with PPI, print pixel resolution.
On my Epson, all the "Photo" quality settings are 720ppi with dpi of 1440, 2880 and 5760.
Terry.
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Seth
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« Reply #33 on: March 31, 2010, 10:42:00 AM »

Doing some research on 16 bit printing, I think I answered one of my own questions.  My HP 8750 printer specifications say it can handle "TIFF 24-bit RGB Uncompressed Interleaved".  These are 8-bit files (8x3=24).  My understanding though, is that the driver automatically downsamples the 16bit files to 8bit, AT THE POINT OF PRINTING.

I also found this article by Mr. Chaney:
http://www.steves-digicams.com/knowledge-center/hype-or-hero-take-2-16-bit-printers.html

I think my course of action is to continue to work in a 16 bit environment right up to printing, and then convert from 16 to 8 bit before printing, regardless of whether I print from Qimage or Photoshop CS4.
Yes, leave it in 16 bit after you leave ACR.  Do not convert to 8-bit; nor should you re-size to 300ppi, 600ppi or anything else.  Beyond cropping (you can leave the ppi box blank) do not resize.  Let QImage do all the interpolation as it prints.  MUCH better than CS interp.

Seth
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Seth
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Terry-M
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« Reply #34 on: March 31, 2010, 11:26:42 AM »

Seth, thank you,
Quote
Beyond cropping (you can leave the ppi box blank) do not resize.
This was the bit of information I did not have in trying to help Chas in a recent post I made. My suspicions are confirmed, he has been re-sizing in CS  Cry
Quote
Let QImage do all the interpolation as it prints.  MUCH better than CS interp.
And thank you for emphasising this most important point; only one interpolation is needed for best quality and that's the Qimage one.  Smiley

Also for Chas,
Quote
That web site is defunct as far as Mike's articles are concerned, they are all here on this one. I did provide the links to similar articles on an earlier post and the one above is there too.
Terry.
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ChasP505
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« Reply #35 on: March 31, 2010, 01:02:13 PM »

My suspicions are confirmed, he has been re-sizing in CS  Cry
Terry, please put your suspicions to rest. I certainly DON'T resize in Photoshop when I'm going to print with Qimage. Never have.  But I WILL resize in Photoshop when I'm printing from Photoshop.
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Chas
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