Hello,

I have been using GIMP for ages and with the move to 2.2, I found that some of the tools that were part of the Image menu are now layers. This is causing me a problem and I have not found the answer yet.

I am using GIMP to process some videos as it allows an easy way to measure pixels and ratios. The problem is there are times when I have to process the image using tools like Layer > Colours > Curves as one example.

Now the issue is how do I repeat this move over all the layers or over a select range of layers automatically? Do I have to write a script to do this or is there a built in tool? The number of layers to be processed can go up to 1000 so doing it manually can be a real pain.

saulgoode@flashingtwelve.brickfilms.com wrote:

Quoting Robin Laing :

I am using GIMP to process some videos as it allows an easy way to measure pixels and ratios. The problem is there are times when I have to process the image using tools like Layer > Colours > Curves as one example.

Now the issue is how do I repeat this move over all the layers or over a select range of layers automatically? Do I have to write a script to do this or is there a built in tool? The number of layers to be processed can go up to 1000 so doing it manually can be a real pain.

I would recommend that you install the GIMP Animation Package (if you haven't already done so). This will add commands (under a new "Video" menu) which will permit you to what you describe plus much more.

One of the commands added is "Filter All Layers" but this has the disadvantage of not being able to choose a subset of layers to filter. I would recommend doing the following:

1) Choose a representative layer of your "video", open up the 'Curves' dialog, and adjust the settings to taste. Save your settings to a file and then CANCEL out of the dialog. I would recommend saving your settings in your home directory , for reasons I will specify later.

2) Perform a "Split Image to Frames". This will convert you multilayer image into separate images of one layer (you should be in RGB Mode and have Unoptimized your multi-layer image)

3) Perform a "Frames Modify" and select "Apply Filter On Layers" using the Function drop-down widget. (If necessary, change the "From frame" and "To frame" range.) Press OK.

4) A new dialog will appear which will let you choose your filter. You should select a function called "plugin-wr-curves", found near the bottom of the list. Click on the "Apply Constant".

5) A file dialog will appear in which you should enter the filename of your saved settings. This dialog does not show hidden directories (which is why I recommended saving your file in ~).

6) You will be presented with a preview and prompted whether to continue before the operation continues.

7) If necessary, use "Frames to Image" to convert the separate images back to a multi-layered image.

Thank you for the in depth reply.

I am just getting caught up with mail after being away.

As this is a clean install of FC6, I searched for an rpm with no luck. The I downloaded the source and found out that my machine didn't have any gcc or other tools. Great.

I will get it up and running and try your instructions.