From Newsgroup: alt.os.linux.mint

GIMP 2.10.36

I have been scanning articles from a journal.
When I opened them in Gimp, reversed the image that was inverted and exported the result, they were still inverted. I cannot remember this being the case in the past.

I have tried to find a solution via Google but nothing seems to work.

Alan
--
Linux Mint 22.1 kernel version 6.8.0-84-generic Cinnamon 6.4.8
AMD Ryzen 7 7700, Radeon RX 6600, 32GB DDR5, 2TB SSD, 2TB Barracuda
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From Newsgroup: alt.os.linux.mint

On Mon, 12/15/2025 9:20 AM, pinnerite wrote:

GIMP 2.10.36

I have been scanning articles from a journal.
When I opened them in Gimp, reversed the image that was inverted
and exported the result, they were still inverted. I cannot remember
this being the case in the past.

I have tried to find a solution via Google but nothing seems to work.

Alan

Some image formats, have a metadata bit indicating the
image should be rotated. This applies a rotation
not captured in the pixmap part.

The Linux "file" command can tell you something of the image type:

file mymysterymeat

JPG file or PNG file or TIFF file and so on.

Some scanners produce TIF, some produce PDF, and so on.
There are a few options for what you're looking at right now.

*******

Let's make up a strawman for you.

An image has the pixmap rotated. The metadata says to
rotate it some more. Alan looks at the image on his
screen, and due to the "total 360" degrees of rotation,
Alan attaches it to an email and sends it to a friend.

The friend comments "why did you send me this upside-down
image, Alan?". Then, Alan cannot figure out what is amiss,
as the image looks just dandy on Alans screen.

The problem in this case, is viewing tools do not
always honour the metadata rotation bit. Alans viewing tool
honoured the bit and added the extra rotation, the friend
of Alan with a less featureful image viewer, the metadata
bit is ignored.

I think you can see from my little strawman, that it behooves
the computer scientist preparing the image, to *remove*
the metadata rotation, then apply whatever physical rotation
is really needed. *Then*, when the friend receives the photo,
it no longer matters whether the friend has an "old" or a "new"
image viewer, the picture looks the same in all of them and
it also looks like it did on Alans screen.

Apple likes to save out images, with metadata rotation asserted.

Paul
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From Newsgroup: alt.os.linux.mint

On Mon, 15 Dec 2025 09:48:53 -0500
Paul <nospam@needed.invalid> wrote:

On Mon, 12/15/2025 9:20 AM, pinnerite wrote:

GIMP 2.10.36

I have been scanning articles from a journal.
When I opened them in Gimp, reversed the image that was inverted
and exported the result, they were still inverted. I cannot remember
this being the case in the past.

I have tried to find a solution via Google but nothing seems to work.

Alan

Some image formats, have a metadata bit indicating the
image should be rotated. This applies a rotation
not captured in the pixmap part.

The Linux "file" command can tell you something of the image type:

file mymysterymeat

JPG file or PNG file or TIFF file and so on.

Some scanners produce TIF, some produce PDF, and so on.
There are a few options for what you're looking at right now.

*******

Let's make up a strawman for you.

An image has the pixmap rotated. The metadata says to
rotate it some more. Alan looks at the image on his
screen, and due to the "total 360" degrees of rotation,
Alan attaches it to an email and sends it to a friend.

The friend comments "why did you send me this upside-down
image, Alan?". Then, Alan cannot figure out what is amiss,
as the image looks just dandy on Alans screen.

The problem in this case, is viewing tools do not
always honour the metadata rotation bit. Alans viewing tool
honoured the bit and added the extra rotation, the friend
of Alan with a less featureful image viewer, the metadata
bit is ignored.

I think you can see from my little strawman, that it behooves
the computer scientist preparing the image, to *remove*
the metadata rotation, then apply whatever physical rotation
is really needed. *Then*, when the friend receives the photo,
it no longer matters whether the friend has an "old" or a "new"
image viewer, the picture looks the same in all of them and
it also looks like it did on Alans screen.

Apple likes to save out images, with metadata rotation asserted.

Paul

Thanks Paul but my problem is simpler.
Usiung Xsane I scanned 3 pages of a magazine article.
For the second one I had to rotate the page.

I loaded them one by one into Gimp to clean them up and re-exported
them. I rotated the second page before re-exporting it.

Finally I installed pdfchain and did it using that.

All the best,
Alan
--
Linux Mint 22.1 kernel version 6.8.0-84-generic Cinnamon 6.4.8
AMD Ryzen 7 7700, Radeon RX 6600, 32GB DDR5, 2TB SSD, 2TB Barracuda
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