Maybe it's worth taking a look at point 6 a. on
http://chandra.harvard.edu/photo/openFITS/casa.html:

Another limitation of using GIMP for a 3 color image is that GIMP does not
> use what are known in Photoshop as "Adjustment Layers". Adjustment Layers
> allow you to make changes to your layers in a non-destructive way. That is
> to say that you do not actually change the layer itself, you apply an
> additional layer to the original layer to make changes. This preserves the
> original layer so you can always go back to its original state at any time.
> The changes we'll make here have to be applied to the original layer, and
> once the file has been saved and closed, you cannot back out of those
> changes. One workaround to this is to duplicate your original layers and do
> all of your work on the duplicates so that you can always go back to the
> original if need be.


How about adding this missing feature to GIMP?

Best wishes,
Łukasz Czerwiński


On Thu, Nov 18, 2010 at 08:36, Marco Ciampa <ciam...@libero.it> wrote:

> With last discover of a little jung black hole by NASA,
> I have found this project on the Chandra X-ray observatory site:
>
> http://chandra.harvard.edu/photo/openFITS/
>
> IMHO it can be very effective to spread the use of GIMP having a page
> dedicated to the interesting / useful real case of GIMP use.
>
> Forgive my bad english...
>
> --
>
>
> Marco Ciampa
>
> +--------------------+
> | Linux User  #78271 |
> | FSFE fellow   #364 |
> +--------------------+
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