Re: [Gimp-user] Gimp on M1 Macbook Air will not export in 300 dpi

Getting back on list again - please "Reply All" to make sure your replies
stay on the mailing list and not come just to me. :)

1. What exact steps are you taking for creating and exporting your image?
2. What site, exactly, is it that you are trying to use - I'm willing to
test uploading to them.
3. I have said nothing about the "inability of GIMP to export PNGs at 300
dpi ...".  Only that "dpi" is a term that makes no sense until it's
printing time.
    a. The only location of this type of data would be in the metadata of a
file.  PNG _does_ have a place for this, but I don't know how commonly it's
used.  I did test it by:

Testing
======

1. Create a new image in GIMP.  Choose whatever dimensions you want.  Use
"File -> New" and in the "Create a New Image" dialog that comes up, expand
the "Advanced Options" where you can set the metadata for the image for X/Y
Resolution.  I chose 300 pixels/inch.
2. Do stuff to the image.
3. Export the image as PNG.  After choosing a filename you'll get the
"Export Image as PNG" dialog to supply further options.  Make sure the
"Save ... (EXIF/XMP/IPTC Data)" are all checked.
4. I then run the image through `exiftool` to double check the metadata
gets written: Pixels Per Unit X: 11811 & Pixels Per Unit Y: 11811  (This
equates to 300 pixels per inch as pixels per meter I believe).

Can you please do all of those above steps one by one and then check that
you get the same thing?  Failing that, feel free to email me your exported
file and I can check the file on my end.

On Fri, Nov 26, 2021 at 5:12 PM Julie Barmazel Stiebritz <[email protected]>
wrote:

> Thanks so much again for your replies!
>
> I understand what you’ve been saying about pixels vs. dpi and how printing
> is supposed to work, but the site that I upload files to doesn’t,
> unfortunately, work like this. They accept only PNGs that are set to 300
> dpi. (I’ve already had a strike against my account for uploading a file
> with 72 dpi, despite the fact that it was giant [in terms of pixels.])
>
> I get the feeling from your replies that the inability of GIMP to export
> PNGs at 300 dpi on new MacBook Airs with the M1 chip is simply considered
> an acceptable feature now and that there’s no fix or plan for one. If I’m
> wrong about this and there are any other options at all, please let me
> know—I’d be deeply grateful.
>
> Thanks again,
>
> Julie
>
>
> On Nov 26, 2021, at 12:31 PM, Pat David <[email protected]> wrote:
>
> Getting back on the list b/c I wasn't paying attention when I initially
> replied to you.
>
> Can you export a PNG file at the size 13,000 x 13,000 pixels?  If so that
> should be all you need.  The print shop/POD will then use whatever dpi they
> want to print at that point.
>
> On Thu, Nov 25, 2021 at 9:35 PM Julie Barmazel Stiebritz <[email protected]>
> wrote:
>
>> Thanks for the reply!
>>
>> I create png files for print on print-on-demand sites that require pngs
>> with 300 dpi. I need files of 13,000 x 13,000 pixels and 300 dpi resolution
>> without exception. (Other sizes/dpi aren’t accepted.)
>>
>> I’ve always been able to do this with GIMP, but not since I got a new
>> MacBook Air with the M1 chip.
>>
>> Is there any way to download a version of GIMP that will work properly on
>> the new MacBook and/or will a fix be in the works? If not, I’ve been
>> looking at Affinity but am really a GIMP fan.
>>
>> Thanks again—much appreciated.
>>
>> Julie
>>
>>
>>
>>
>>
>> On Nov 25, 2021, at 6:48 PM, Pat David <[email protected]> wrote:
>>
>> Are you exporting an image format? (jog, png, etc?)
>>
>> If so, don’t worry about the “print size” - worry about the final output
>> total resolution (4800x3000 etc).
>>
>> On Thu, Nov 25, 2021 at 6:27 PM Julie Barmazel Stiebritz via
>> gimp-user-list <[email protected]> wrote:
>>
>>> Hi there. I’ve installed GIMP 2.10 (first .24 and then .28) on a new
>>> MacBook Air with M1.
>>> It will not adjust print size on export.
>>> I can change the image print size while on Gimp to 300 dpi, but the
>>> export is always 72 dpi.
>>> Have deleted and reinstalled GIMP; have used current update.
>>> GIMP will only export docs in 72 dpi.
>>>
>>> Checked the issues archive and can find the problem discussed but no
>>> resolution.
>>> Makes GIMP unusable for me :(((
>>>
>>> Many thanks!
>>> Julie
>>>
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>> --
>> https://patdavid.net
>> GPG: 66D1 7CA6 8088 4874 946D  18BD 67C7 6219 89E9 57AC
>>
>>
>
> --
> https://patdavid.net
> GPG: 66D1 7CA6 8088 4874 946D  18BD 67C7 6219 89E9 57AC
>
>
>

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