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Raster images are composed of pixels. Common raster formats are png, jpg, tif, and gif. Photographs are almost always stored in raster format, typically jpg. Gimp's maturity, reliability, and popularity make it highly recommended for raster editing. We suggest starting with introduction videos like those shown here and then proceeding to the official documentation.
You may wish to create your own Gimp theme. This is useful if, for example, you'd like to increase the font size on a HiDPI display. Here are the steps:
# Create directory for themecd ~/.config/GIMP/2.10/themes/;
mkdir mine.Dark;
# Copy and symlinkcd mine.Dark;
cp /usr/share/gimp/2.0/themes/Dark/gtkrc ./;
ln -s /usr/share/gimp/2.0/themes/Dark/ui ./
Now edit gtkrc and change font_name = "Sans 11" so that the font is as you like it. For example, you can use font_name = "Noto Sans 16". There are many other parameters you can adjust too. Save the file, then open Gimp and use Edit > Preferences > Interface > Theme to select your new theme. Source: Superuser.
Inkscape can open and save Adobe Illustrator files.
Vector images are described by mathematical expressions. Common vector formats include svg, woff, ttf, and otf. Icons and fonts are frequently written in vector formats because they scale very well and usually require far less memory than raster formats.
We recommend Inkscape for vector editing because it is mature, reliable, and very popular. We suggest exploring the capabilities using the excellent Inkscape Tutorials.
Krita is an alternative raster editor definitely worth consideration. One can easily install it using the Discover application or by entering sudo apt install krita in a terminal.
Q: Some tools appear missing in Gimp. How can I get them back?
A. Gimp has employed tool groups to reduce clutter. One can restore the ungrouped tools by unchecking the option found in File > Preferences > Interface > Toolbox > [ ] Use tool groups.
Q: Gimp won't allow me to invert selections. How can I fix this?
A: OpenCL may prevent inverting selections from working. The only way you can have this enabled is if you had launched gimp --show-playground. You may have to revisit that and turn it off.
Launch the app with gimp --show-playground
Click on Edit > Preferences > Playground
Turn off Use OpenCL.
Disable experimental OpenCL acceleration in GIMP to avoid glitches.
We try hard to provide a useful solution validated by professionals. However, we cannot anticipate every situation, and therefore cannot guarantee this procedure will work for your needs. Always backup your data and test the solution to determine the correct procedure for you.
THIS SOLUTION IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS “AS IS” AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOLUTION, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Raster Editing with Gimp
Vector Editing with Inkscape
Flowcharts and Slides with LibreOffice Draw
