Workflow and color spaces in Darktable and GIMP to print images?

I started printing some of my photos, but this has led me along a path where I don't know if I'm doing things correctly and they ask me questions about which I don't know the answers. Here it goes:

  • I use Ubuntu (18.04), Darktable (2.6) and Gimp (2.10).
  • My photos are taken in the "Adobe RGB" color space. I have put this option in my two cameras.
  • I have used Agryll to calibrate my monitor in color with a Spyder 4 Elite. The Agryll profile is installed on the entire system (on my desktop, I choose the settings -> Devices -> Color and see the profile installed for my monitor)
  • When I work on an image I intend to print, I choose "Adobe RGB" in "output color profile" in Darktable.
  • When I export the image from Darktable, I choose TIFF, 16 bits and "Adobe RGB" as a profile.
  • When I import the images into Gimp, Gimp asks me if I want to convert the images to sRGB. I say no, since Adobe RGB is better.
  • Once I finish my work, I save the image as TIFF again and take this to where I want to print it.
  • The reason I want to save it as TIFF, 16 bits, and in Adobe RGB, is to have more color and more information in the image, because the person (s) who prints the image often works on the image (in cooperation with me) to do it right.

So, my questions are:

  1. Do I not need to install any profile for my monitor in Gimp or Darktable, because both Gimp and Darktable (by default) use the entire system profile? Without the need to configure any settings in Gimp / Darktable?
  2. Is the previous workflow, with the use of 16-bit TIFF and "Adobe RGB", the correct way to get as much information as possible in the image along the way?
  3. When opening the TIFF file in Gimp, why does Gimp ask me to convert the integrated profile to "sRGB"? My understanding is that "Adobe RGB" is better?
  4. Is there anything I should be aware of that I haven't mentioned? Or something I am missing? Like some configurations and Darktable / Gimp should I configure or verify?

Gimp in W10 installs qmlexporter.py

I need your help: I ​​installed GIMP 2.10 and I also wanted to use the qmlexporter.py add-on, but it will not work, simply by placing it in the add-ons folder.
Information states: https: //doc.qt.io/qtcreator/quick-export-to-qml.html
Does there have to be an edit in design mode? What ??
Has anyone done this before and knows the way?
Thank you

post processing: the Gimp perspective tool is not really transforming

I have uploaded a screenshot below to illustrate the problem. I dragged a jpeg to Gimp, clicked on the perspective tool and then tried to use it … but as you can see, it's not really transforming the image. Why is this so?

Click to enlarge the image.

enter the description of the image here

apt-get upgrade will not update gimp from the ppa

I've been playing with Ubuntu Mini 18.04 LTS ISO tonight and tried to install a ppa for GIMP because 2.8 simply would not cut it. The ppa that I used is ppa: otto-kesselgulasch / gimp.

By doing apt-get update and apt-get upgrade, it shows that nothing has been updated. I installed the update manager to see if it can do it, but it says that my system is up to date.

Looking at the output of the terminal for apt-get upgrade and apt-get install gimp, one thing caught my attention, and 1 not updated. I'm not sure what exactly that means and how it can help me, I just have the feeling that it's important for this. Here are some terminal exits to start.

james @ ubuntu: ~ $ sudo apt-get update
Hit: 1 http://us.archive.ubuntu.com/ubuntu bionic InRelease
Get: 2 http://us.archive.ubuntu.com/ubuntu bionic-updates InRelease [88.7 kB]   
Get: 3 http://security.ubuntu.com/ubuntu bionic-security InRelease [88.7 kB]    
Hit: 4 http://ppa.launchpad.net/libreoffice/ppa/ubuntu bionic InRelease
Hit: 5 http://ppa.launchpad.net/otto-kesselgulasch/gimp/ubuntu bionic InRelease
Fetched 177 kB in 1 s (288 kB / s)
Reading the lists of packages ... Done
james @ ubuntu: ~ $ sudo apt-get upgrade
Reading the lists of packages ... Done
Dependency tree of the building
Reading state information ... Done
Update calculation ... Done
The following packages have been retained:
gimp data
0 updated, 0 newly installed, 0 to delete and 1 not updated.
james @ ubuntu: ~ $ sudo apt-get install gimp
Reading the lists of packages ... Done
Dependency tree of the building
Reading state information ... Done
gimp is already the most recent version (2.8.22-1).
0 updated, 0 newly installed, 0 to delete and 1 not updated.

clipping – A simpler way to select the paper picture in Gimp?

When I scan photos on my printer, sometimes it is a silly printer and it does not take out the background, especially when there is a lot of white. How would I do this in my sample photo other than the selection with the selection tool? The autoclave and the jealous harvest do nothing.

Color correction: How can I desaturate the reds in postprocessing with Rawtherapee (or Gimp)?

I took some art images in the sunlight. I used the Rawtherapee pipette to find a white balance with which I am happy, but the red one is too bright.

How can I desaturate only the red ones?

I had some success reducing the contrast, but obviously it affects the whole image.

Here is an example. Left is the original image, red is too bright. On the right is the corrected image, here obtained with the contrast set at -20 (with Gimp): red is correct, but not the other colors.

Intense red

Bucket tool based on lower layer in GIMP.

In GIMP, I want to use the cube tool to fill certain areas of my image, but I would like to do it in a higher layer instead of directly in the image.

I think I need to adjust some of the layer settings somewhere so that the cube tool recognizes the edges of the lower layer, but I can not figure it out.

Gimp – Average selection HSV values

I want GIMP to calculate the Hue, Saturation and Average value of a selection.

You could select several pixels of the desired area and read the values ​​of the FG / BG Color tongue. This would be tremendously inefficient; I have to do about 100 of these.

Preferably, it would be automagic: the reading out of the average RGB values ​​and its conversion to HSV would be acceptable, although suboptimal.

Do all the gimp color functions not work and have I tried all the suggested corrections?

Gimp is set to rgb. Only one layer of the base image. It will be reversed, but any of the color management tools does not do anything, gimpo worked 20 minutes ago, so I think it's something I did. But I have reconfigured the default settings that did not work, I simply uninstalled and reinstalled what did not work, please help! I can not do anything with colors.

GIMP. How to add a small, movable, resizeable image to a larger image?

I have a small image of & # 39; stamp & # 39; I want to put over the documents. Type of seal & # 39; they. The stamp is largely transparent, the stamped document must be displayed.

I find opening the base document and then & # 39; open as layers & # 39; the document & # 39; stamp & # 39; It brings the stamp as a layer in the first document.

But it's delineated with crawling ants, I can not fix that. And I can not find a handle to change the size. And when I move it, the whole image moves, the image & # 39; base & # 39; and all.

What am I doing wrong.