P: Allow UI to specify resolution above 10,000+ DPI

Thank you very much Chris! Let me know when you have any updates! Much appreciated.

OK, I'll have to review the previous bug reports to see at what point we have overflow issues, and see if we can extend the ppi UI limit that far.

Chris,

Given our development pace currently, we would probably like a cap of 25,000 DPI. This gives us wiggle room for any advancements in our partners' micro print capabilities for the near future. But we absolutely must have up to 10,160 for our current project. We also had dabbled with that 12,400 number I mentioned.

So yes, if possible, we'd like to see a 25k resolution cap. Thanks.

Looking at the code, CS5 was a bit lax on enforcing some of the limits, and had higher limits in a few places (aka inconsistent limits) which led to errors later (due to overflows in math). In later versions of Photoshop, those UI bugs were fixed. But it is possible that the current limit is lower than it could be -- so I'm asking what limits you really need.

Chris,

OK, so there is an intended limit set in the UI. I assume this is the 9999.999DPI number.

If so, why am I able to surpass this number and not have errors or problems on CS5 and earlier?

I still am very curious to know if you can recreate this on the download trial of CS5. My guess is yes. Regardless of whether there is an intended limit set at 10,000 DPI that you all have put in place to avoid potential calculation errors, we would like to go above that value as we have become accustomed to using it on older CS versions. How can we expect this problem to be resolved, if at all?

The total size doesn't matter. It's the resolution value that matters here, and the limits needed to avoid overflows and other errors in calculations.

Photoshop has to have some numerical limits to avoid overflowing the values used to store resolution, and to avoid errors in calculations involving the resolution. That's just basic UI coding.

You just happen to want a limit higher than the current limit.

BTW: 812.8 ppi == 320 ppcm
and 10160 ppcm == 25806.4 ppi

Chris,

Resolutions vary by press. One of the resolutions needed is 10160 which is metric friendly, not pixels per INCH. Hence the centimeters.

Another application for a micro-press we are working with calls for 12400 DPI. But again, not sure why PS wants to dictate my desired resolution if that's how we need to work. There is even a commercial press out there from HP that as a resolution of 812.8 DPI, and we need files to be that exact resolution to avoid scaling pixel 'jumps' (reset lines in an image) when these files are output on a press.

-Mike

Jeff and Chris,

I am not sure what limits you are encountering, but I am having no trouble working with the resolutions above 10,000 as needed on CS5 installed on our Mac Pro, nor on the trial version I downloaded last week.

You are correct than when working with CS6 and ask for a higher res than 10,000 DPI, you get a window prompt:



However, regardless of our image settings in pixels, inches or centimeters on CS5 we get the image we need. Screenshots below:





The only indication of possible issues was this compatibility prompt, saying images greater than 30,000 pixels could lead to issues with older versions of PS. We have swapped TIFF files between CS3, CS5, and Macs new and old and never had compatibility issues. We always work with TIFF files.



Lastly, the version of CS5 all these screenshots were from; downloaded from your servers 2 days ago on another one of our Macs. Chris, I see your name ;)



Again not sure how you're getting your limits from all versions. I recommend downloading a CS5 trial fresh and trying for yourself. But even our old versions from DVD copies have never bugged out on us or kept us from making any resolution we want.

Keep in mind, these images are for currency, so we will never have an image larger than say, 10 x 10 centimeters or so. Perhaps after you get to larger sizes, a high-res file wants to 'resize' itself to a bigger image with a lower res because it doesn't see the need for 10,000 plus on something that large. We have never tried something like 10 by 20 inches.

-Mike