Re: [Gimp-user] Save and automatically apply a series of editing steps

[Elle Stone]

I'd like to be able to open an image file in GIMP (GIMP 2.9, not sure if
the version makes a difference) and have a series of editing steps
performed automatically.


If I were asking this question just for myself, I'd probably assume that 
figuring out "how to" is too much trouble.


However, in addition to my own interest in being able to automate 
applying a series of editing steps, recently two other people have sent 
me emails asking the same question.


Both of these people are new to GIMP and using my patched version GIMP 
2.9 from git. They both seem to like high bit depth GIMP quite a lot. 
And both of them are looking for ways to automate steps for faster 
throughput when there are a lot of images to edit all at once.


I'm in a total state of confusion as to what Pat's and Kevin's answers 
actually mean in practical "how to" terms, so my apologies but I'll try 
asking again:


Is it possible right now for users to automate a series of editing steps 
in high bit depth GIMP? If yes, is there a guide somewhere? Will the 
resulting images be high bit depth images or only 8-bit images?


Best regards,
Elle

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Re: [Gimp-user] Save and automatically apply a series of editing steps

[Kevin Payne]

 Yes it is possible to automate a sequence of steps, BUT it's a programmatic 
solution - you have to write scripts in Scheme, Python or maybe Perl.

At present (in 2.8.x) the support for scripts is firmly based around low 
bit-depth. I was asking if the API has been updated to incorporate the high-bit 
depth features (and all the GEGL operations), but perhaps that question (and 
the multitude of associated questions) would be better placed on the developers 
mailing list.

Kevin

From: gimp-user-list  on behalf of Elle Stone 

Sent: 07 December 2015 16:14
To: gimp-user-list@gnome.org
Subject: Re: [Gimp-user] Save and automatically apply a series of editing steps

>> I'd like to be able to open an image file in GIMP (GIMP 2.9, not sure if
>> the version makes a difference) and have a series of editing steps
>> performed automatically.

If I were asking this question just for myself, I'd probably assume that
figuring out "how to" is too much trouble.

However, in addition to my own interest in being able to automate
applying a series of editing steps, recently two other people have sent
me emails asking the same question.

Both of these people are new to GIMP and using my patched version GIMP
2.9 from git. They both seem to like high bit depth GIMP quite a lot.
And both of them are looking for ways to automate steps for faster
throughput when there are a lot of images to edit all at once.

I'm in a total state of confusion as to what Pat's and Kevin's answers
actually mean in practical "how to" terms, so my apologies but I'll try
asking again:

Is it possible right now for users to automate a series of editing steps
in high bit depth GIMP? If yes, is there a guide somewhere? Will the
resulting images be high bit depth images or only 8-bit images?

Best regards,
Elle

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Re: [Gimp-user] Save and automatically apply a series of editing steps

[Elle Stone]

On 12/07/2015 11:43 AM, Kevin Payne wrote:

  Yes it is possible to automate a sequence of steps, BUT it's a programmatic 
solution - you have to write scripts in Scheme, Python or maybe Perl.

At present (in 2.8.x) the support for scripts is firmly based around low 
bit-depth. I was asking if the API has been updated to incorporate the high-bit 
depth features (and all the GEGL operations), but perhaps that question (and 
the multitude of associated questions) would be better placed on the developers 
mailing list.


Kevin, thanks! I'll go ask on the developer's list.

Elle

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Re: [Gimp-user] opening 2.9.3 file in 2.8.14 (NOT)

[Jehan Pagès]

Hi,

On Sat, Dec 5, 2015 at 7:26 PM, Akkana Peck  wrote:
>> scott092707 (for...@gimpusers.com) wrote:
>> > Will this always happen, if I try to open a file saved in an 
>> > earlier-vintage
>> > GIMP?
>
> Simon Budig writes:
>> No, this will not always happen, just when you use features that are not
>> available in the older gimp version - e.g. high precision pixel formats.
>
> If I load a JPEG into git master built a few days ago, make no
> changes and immediately save as XCF, then exit and try to open
> that XCF in GIMP 2.8, it fails:
>   "Opening '/tmp/can7795-scale.xcf' failed: XCF error:
>   unsupported XCF file version 8 encountered"

We have a new zlib compression, which is much more efficient than the
previous RLE compression (like 2 or 3 times smaller files). Yet we are
aware that for some people, retro-compatibility is more important than
small files. This is why you have a case "Save this XCF file with
maximum compatibility" in the save dialog. When you check it, it will
save a XCF with the older compression, which can be opened with GIMP
2.8, probably even GIMP 2.6 or older!

BUT jpeg images have metadata, and as you know, GIMP 2.9 has new
metadata support. This by itself is a new feature which was not
supported on older GIMP. So when you create a XCF from a JPEG made by
a camera, the checkbox "Save this XCF file with maximum compatibility"
will be grayed-out because anyway, this is not possible to make the
file 2.8-compatible if you want metadata support.

Same if you create high precision images.

Same if you use the new overlay mode on layers.

> It would be great if the files were incompatible only if you use
> new features that the old XCF doesn't support, as Simon says; but
> so far, it seems XCFs saved by 2.9 are never compatible with 2.8.

As explained above, no it is exactly as Simon says. If you create an
image from scratch (as a painter or designer for instance), in 8-bit
and without overlay layers, you will always have the possibility to
check the "compatibility" box if retro-compatibility is very important
to you.

But images from photos made by camera (hence with a lot of metadata), nope.

Now, it would be cool if you could get rid of the metadata, for people
who don't care about them and prefer retro-compatibility.
Unfortunately we don't have metadata editing (hence erasing) support
yet. Only reading and saving. We welcome developers interested by the
topic and who want to contribute. I believe metadata editing is a
much-needed and wanted features by many people. :-)

But for now, until some people comes up and implement this, we can't
have the cake and eat it: new features in the XCF format means higher
format version. There is no escaping it.

Maybe a good feature could be to have a small text listing exactly the
reason(s) why an image cannot be saved in compatibility mode (overlay
layer, high bit depth, metadata or a mix of 2 or 3 of these features.
The new compression is the only feature which is bypassable and does
not block compatibility mode).

Jehan

> I've wished many times for a way to save "old XCF" format. I've been
> using 2.9 for most of my GIMPing, but there are a few images I'd
> like to be able to share with other people or edit on machines that
> don't have the libraries needed for 2.9. I try to remember to edit
> those images only with 2.8, but I forget, and once they've been
> saved with 2.9 even once they're forever out of reach of 2.8.
>
> ...Akkana
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