I have some satellite imagery of the same area bur from different times. I want to show where development has occurred.

The satellite images are all the the same extent but come from different sources and look a lot different from one another. While the changes in developed areas is visible it gets lost in all the other differences in the images.


I thought it might be best to use edge detect with the magic wand to select the developed areas in another layer  and then turn it to just black and white, then change the colors of that area to some other color. I also thought because the satellite images were quite variable in how they looked, some were nice and full color others were more black and white and some it looks like some tiles were color and others more grayscale.

I could do that. I later thought I'd colorize the base grayscale layer to green. It sort of matches what I'm trying to show and gets lost even in the full color images when I go to grayscale. 

I find though that when I overlay the layer with just the developed areas with an alpha background that the bottom colorized layer loses it colorization. I read something about turning the alpha lock on so I did that for the base layer and also the top layer and that didn't change anything. It went from colorized back to grayscale.

Does anyone know why it is doing this and how to keep if from doing this.

For that matter, I described what I'm trying to do because I have to think this sort of thing has been done many times by others. Maybe there is another way that is easier or maybe that just works.

I have used GIMP on and off for quite a few years now, but never really for this sort of thing. I'm also using v3.06 for Linux. I think it is a flatpack build as well for what its worth.

I am a novice to Gimp 3.0.6. I used Photoshop for decades untill Adobe's policies made me leave.

My pc runs Win 11 with an AMD 64 processor.

In Photoshop a layer with a mask shows a locking-icon. "Locked" will lock the relative movements between image and mask - and "unlocked" will allowe them to be moved separately.

This has nothing to do with Gimp's options to protect the content of the layer against editing or movement (as far as can see).

One of my layers in Gimp shows an image icon and its mask icon - and apparently there's no option to lock their relative movement?

Example: 
With the Move tool active and the image at eg. 400% trying to move the image and the mask together within the borders of the screen results in two unexpected behaviors:
1. with the mask icon active a selection of the mask becomes visible and moves independently of the image.
2. with the image icon active the image moves relative to the mask.

How can I make them move together - like in PS when the small locking-icon shows "locked"?

Hi, Using gimp 3.0.4 and Debian.

Is anyone else having problems when two images are open in multi window mode?

It's causing extra behaviour when doing for example:
    Image -> Guides -> New Guide (by percent)
    Image -> Guides -> Remove all Guides
    File -> Export As

one or more of these occur as well:
    Lock a path
    Lock and unlock layers
    Make a layer visible

I cannot spot a pattern that triggers it apart from it's worse the more that's in the image e.g.  having paths and/or layer masks present.

It's fine in single window mode.
It's fine in both single window mode and multi window mode when only one image is open.
I have not tried it in other versions of gimp 3 as I only have 3.0.4 available.

   

https://www.gimp-forum.net/misc.php?action=help&hid=9

With respect: See the above for the forum rules. In particular
This is an English speaking forum. Post in English. Every effort is made to assist users where English is not first language.

Thank you.

https://www.gimp-forum.net/misc.php?action=help&hid=9

With respect: see the above for the forum rules. In particular

This is an English speaking forum. Post in English. Every effort is made to assist users where English is not first language.

Thank you.

RapidRAW for quick ajustments, a non-destructive, and GPU-accelerated RAW image editor built with performance in mind.
Just 20 MB - lighter than a RAW image.https://www.getrapidraw.com

https://github.com/CyberTimon/RapidRAW/r...tag/v1.4.3

   

Hi everyone,

GIMP defines many custom GEGL operations with the gimp:* prefix (for example, gimp:color-balance, gimp:threshold, etc.).
As far as I can tell, these are registered programmatically inside GIMP during startup - they don’t exist as separate loadable GEGL plugins or .so files.

Is there any supported or practical way to make these gimp:* operations available to an external GEGL-based application, or to initialize the same set of operations in another process?

Specifically:

- Can GIMP’s GEGL operation registration be triggered externally (e.g. by linking or loading GIMP libraries)?
- Has anyone successfully reused these operations outside of GIMP’s runtime environment?
- Or is embedding code inside GIMP itself the only way to access them?

Any insight or code references from the GIMP source tree where these ops are registered would be very helpful.

Thanks!

Hello forum !

I'm completely new to GIMP so I fear my questions will be very basic...
Thanks in advance for those who will have patience with me 

My first challenge : I have a round object (say, a large smiley) on a square jpg, white background.
I can select the object easily, but how can I remove the background ?
I tried adding a layer without background but get the full square each time I copy onto this new layer...

Just re-installed Gimp 3.0.6 on Windows 11. Upon opening a jpg Gimp shows a featureless black screen. 
Gimp Vid

Right clicking a jpg and choosing 'open with Gimp' produces a similar effect. Any suggestions or help welcome. Thanks.

I am struggling with the recently added ability to use outlined and filled text. Sometimes it works, and sometimes it does not. As I am a novice in GIMP, the problem may be me. That is, there may be something I am failing to do. I click the icon to insert text and with the 'Filled' option, the text is visible. Then, I click the 'Outlined and filled' and nothing happens. However, a few times this has worked. Is it an inconsistency, being a new feature, or is it an inconsistency of my being a new user? Any advice on this will be much appreciated. Thank you.