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Print Tool image sizing

Print Tool image sizing

2015-03-09 by jeff.grant@...

Probably a dumb question, but I don't understand what Print Tool will do if I put multiple images on a page with different resolutions. Say I have one image sized to 480 and another at 360PPI, will Print Tool work it out, or will I get one or both the wrong size?

Re: [QuadtoneRIP] Print Tool image sizing

2015-03-09 by Roy Harrington

Print-Tool works it out -- with help from the OS which does the actual resampling.
Roy
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On Sun, Mar 8, 2015 at 6:37 PM, jeff.grant@... [QuadtoneRIP] <QuadtoneRIP@yahoogroups.com> wrote:


Probably a dumb question, but I don't understand what Print Tool will do if I put multiple images on a page with different resolutions. Say I have one image sized to 480 and another at 360PPI, will Print Tool work it out, or will I get one or both the wrong size?






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Re: [QuadtoneRIP] Print Tool image sizing

2015-03-11 by jeff.grant@...

Thinking about resizing a little more, Jon Cone advised me to set DPI in the image and let QTR sort it out. I have been using PK Sharpener to set the DPI by telling it the print size. This gives me odd numbers like 463DPI. Can QTR use any number or does it resize to one of the multiples like 360, 480 or whatever?

Re: [QuadtoneRIP] Print Tool image sizing

2015-03-11 by Roy Harrington

If you have a really low resolution image (less than 200-240 maybe) you may want to upsample
using Photoshop or some special technique so you can sharpen or whatever afterward.
But as long as you have decent resolution I'd just pass the image in as is -- 463ppi would be just fine.
On the way to dithering QTR driver will be up sampling to 720ppi regardless of what you send.

Roy
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On Tue, Mar 10, 2015 at 6:19 PM, jeff.grant@... [QuadtoneRIP] <QuadtoneRIP@yahoogroups.com> wrote:


Thinking about resizing a little more, Jon Cone advised me to set DPI in the image and let QTR sort it out. I have been using PK Sharpener to set the DPI by telling it the print size. This gives me odd numbers like 463DPI. Can QTR use any number or does it resize to one of the multiples like 360, 480 or whatever?




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Re: [QuadtoneRIP] Print Tool image sizing

2015-03-11 by Jacques Caron

Hi

Reading your answer, since I have plenty of resolution in my originals, should I save my pictures (out of Photoshop) at 720 dpi for a maximum sharpness?

Thanks

Le 2015-03-11 à 00:24, Roy Harrington roy@... [QuadtoneRIP] <QuadtoneRIP@yahoogroups.com> a écrit :



If you have a really low resolution image (less than 200-240 maybe) you may want to upsample
using Photoshop or some special technique so you can sharpen or whatever afterward.
But as long as you have decent resolution I'd just pass the image in as is -- 463ppi would be just fine.
On the way to dithering QTR driver will be up sampling to 720ppi regardless of what you send.

Roy

Jacques Caron

Re: [QuadtoneRIP] Print Tool image sizing

2015-03-11 by Roy Harrington



On Wed, Mar 11, 2015 at 10:56 AM, Jacques Caron jacques.caron@... [QuadtoneRIP] <QuadtoneRIP@yahoogroups.com> wrote:

Hi

Reading your answer, since I have plenty of resolution in my originals, should I save my pictures (out of Photoshop) at 720 dpi for a maximum sharpness?

Thanks


You really have got to try stuff like this. Anything that involves "what happens on a print" is
up to you/whoever wants to know.
Roy


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Re: [QuadtoneRIP] Print Tool image sizing

2015-03-11 by Jacques Caron

Thanks

Just asking since nowhere in Print Tool User guide there is the mention that the software will "sample up" at 720.

For sure I'll try it out but wanted to know also is someone already tried it.

Jacques
Le 2015-03-11 à 15:05, "Roy Harrington roy@... [QuadtoneRIP]" <QuadtoneRIP@yahoogroups.com> a écrit :

You really have got to try stuff like this. Anything that involves "what happens on a print" is
up to you/whoever wants to know.
Roy

Jacques Caron

Re: [QuadtoneRIP] Print Tool image sizing

2015-03-11 by richard@...

I've been all over the documentation and 720ppi thing isnt mentioned anywhere, but Roy has addressed a few times it here, as well as other forums. But he said it; you gotta see what works for you.

Personally, I used to be very picky about downsampling to the 720ppi output resolution, but determined that unless I am printing a huge file at a much smaller size I don't usually bother anymore. I base my scanning resolution based on how big I want to print so I would scan a 120 film to print at 360 at 24x24, and then down sample a copy to 360ppi at 16x16, and use that file to print an 8x8 at 720, Now that I am doing a lot more with digital capture if I have a file that will print between 300ppi and 720ppi I leave it alone and just let the driver do the work. I don't print larger than the file will go on its own without up-sampling so that can of worms is never really an issue...

Richard Boutwell

Re: [QuadtoneRIP] Print Tool image sizing

2015-03-11 by Jacques Caron

Thanks

I'll try different resolution to see what I like best.

Jacques

Le 2015-03-11 à 16:42, "richard@... [QuadtoneRIP]" <QuadtoneRIP@yahoogroups.com> a écrit :



I've been all over the documentation and 720ppi thing isnt mentioned anywhere, but Roy has addressed a few times it here, as well as other forums. But he said it; you gotta see what works for you.

Personally, I used to be very picky about downsampling to the 720ppi output resolution, but determined that unless I am printing a huge file at a much smaller size I don't usually bother anymore. I base my scanning resolution based on how big I want to print so I would scan a 120 film to print at 360 at 24x24, and then down sample a copy to 360ppi at 16x16, and use that file to print an 8x8 at 720, Now that I am doing a lot more with digital capture if I have a file that will print between 300ppi and 720ppi I leave it alone and just let the driver do the work. I don't print larger than the file will go on its own without up-sampling so that can of worms is never really an issue...

Richard Boutwell




Jacques Caron

Re: Print Tool image sizing

2015-03-11 by brian_downunda@...

This discussion has been about Print Tool. Does the same 720 thing happen with QTR on Windows?

As Jeff said, there's a comment in Jon Cone's new piezography manual that suggests that QTR uses whatever you give it, which at first glance doesn't seem to quite gel with what Roy said. But perhaps there's more going on in QTR than we realise.

Re: [QuadtoneRIP] Re: Print Tool image sizing

2015-03-12 by Roy Harrington

Print-Tool does not resample any images for printing -- never. Print drivers "ask"
the OS for what data they want and OSX converts as necessary. So Print-Tool
knows nothing about 720ppi or any other ppi -- it just send whole files to the OSX print
system. QTR works on 720ppi input data so on Mac OSX that is provided by the
system, on PC there is an extra step to resample to 720ppi for QTR. Epson
drivers for instance demand either 360ppi or 720ppi for input, Canon and HP
are different still.

As far as advice I think both Jon Cone & myself, and others have pretty much
always advocated to just send QTR what you have. You might create artificial
files that can demonstrate these re-sampling but for real images I really don't
think any of this matters a whole lot. In general QTR does overkill on most
printing matters to make it a non-issue.

Roy
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On Wed, Mar 11, 2015 at 3:01 PM, brian_downunda@... [QuadtoneRIP] <QuadtoneRIP@yahoogroups.com> wrote:


This discussion has been about Print Tool. Does the same 720 thing happen with QTR on Windows?

As Jeff said, there's a comment in Jon Cone's new piezography manual that suggests that QTR uses whatever you give it, which at first glance doesn't seem to quite gel with what Roy said. But perhaps there's more going on in QTR than we realise.




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