Discarding from greyscale image [FIXED]

Summary:

Error creating new layer for discard from greyscale image.

Discarding from greyscale image

bootchk (guest) 12 Mar 2009 12:44

Opened greyscale image in Gimp.
Chose Layer>Liquid Rescale.
Chose New button in the Feature Discard Layer group.
Got this error message:

Calling error for procedure 'gimp-image-add-layer':
Image 'file:///home/bootch/LeefersFarmArt/Trial.pnm' (1) is of type 'gray', but an image of type 'rgb' is expected

I'm trying to dissappear (or remove or discard) an object.

I understand that this is not a high priority (greyscale a small portion of use) ( I can probably work around it) and that maybe it is a known limitation.
I searched for RGB in the tutorial and the manual but found no mention that discarding only works for color images.
It must be related to the need for a color (red) highlight for the selection to discard.

Re: Discarding from greyscale image

CarloB 12 Mar 2009 12:52

Thanks for the report, this is not a limitation but definitely a bug.
I'll investigate on this as soon as I have some time and fix this in the next release.[SEE NEXT POST] In the meanwhile a workaround would be converting the image to RGB before using the plugin and reverting it to greyscale at the end (this might be a problem for large images, though, as RGB requires more memory).

Last edited on 13 Mar 2009 21:36 by CarloB Show more

Re: Discarding from greyscale image

CarloB 13 Mar 2009 21:33

Are you using an old version of the plugin?
I recalled (and then checked) that I have already fixed this bug since version 0.5.1.

Re: Discarding from greyscale image

bootchk (guest) 16 Mar 2009 13:27

The LqR plugin dialog doesn't give the version, so I couldn't get a quick answer.

I am using Ubuntu 8.10 and used synaptic package manager to download gimp-plugin-registry (which includes LqR) a few days ago. It is likely that it doesn't include your latest bug fixes.

Like you, when I get time, I will give a definitive answer. But I am not proficient in finding the versions of things yet.

Thanks

BTW I have some suggestions for improving the user interface. Along the line of: use words that describe the goal, and that nieve users can understand, rather than words that describe the techniques that only expert Gimp users can understand. For example, use "Zoom" for the technique of applying LqR, then applying LqR again back to the original size. If I get time, I will post to "Request a feature."

Re: Discarding from greyscale image

CarloB 16 Mar 2009 14:14

The version of the plugin currently included in the Ubuntu repositories is rather old (it's version 0.4, current is 0.6).
You can get the latest version by installing it (and its companion library liblqr) from source, but first you would need to uninstall the gimp-plugin-registry package (and the liblqr library package as well), and then follow the instructions here. Note however that by doing this you will also uninstall some other useful plugins which are included in gimp-plugin-registry, which you'll have to reinstall manually then.

About suggestions: they are always very welcome, but please consider the latest version as basis for improvement if possible.

BTW to find out which plugins are included in gimp-plugin-registry and what is their version you can read the description of the package with Synaptic.