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Graphics software: Gimp, Inkscape, ImageMagick, Blender, ShareX.

Gimp is a free, open source, and extremely powerful image editing program

Gimp is a free, open source, and extremely powerful image editing program

GIMP is expandable and extendible. You can install new brushes (Techzillo, Noupe), patterns, gradients, plug-ins, and scripts. How to install them? Find the appropriate folder (Edit, Preferences, Folders) and drop them there. G’MIC is a full-featured open-source framework for digital image processing. G’MIC-Qt is a plug-in to bring G’MIC capabilities to GIMP and other image editing programs. Once that you have installed it, you will have it accessible in Filters, G’MIC-Qt

G'MIC

G'MIC

Some tips. Round corners of an image: Filters, Decor, Rounded Corners. Scaling/resizing photos: Go to the menu Image and choose Scale Image (Interpolation: NoHalo and LoHalo reduce the blur in the resampled images). Sharpen an image: Filters, Enhance, Sharpen (Unsharp Mask). Blur an image: Filters, Blur, Gaussian Blur… Adjust brightness: Colours, Brightness-Contrast… or Colours, Curves. Create a shadow effect: A. Write your text on the canvas by selecting Tool, and then Text, by clicking the tool icon A or by using the T keyboard shortcut. B. Filters, Light and Shadows, Drop Shadow.

Create a text outline: A. Write your text. Then, right-click on the text and select Path from Text. B. Create a new layer (Layer, New Layer. Fill with: Transparency). C. Select, From Path, and then go to the menu Select again, and choose Grow (4-5 pixels). D. Select the bucket tool (Tools, Paint Tools, Bucket Fill or the shorcut Shift+B) and fill the selected area. E. De-select with Select, None. F. Move the layer with the outline down.

Inkscape

Inkscape

Command-line Tools

  1. Display a single file/all the files in a directory: display myImage.jpg / display *.png.

  2. Flip image in the vertical/horizontal direction: display -flip myImage.jpg / display -flop myImage.jpg.

  3. Convert [a single file/all the files in a directory] between image formats: convert bridge.jpg -monochrome bridgeMonochrome.jpg (it transforms bridge.jpg to black and white) / convert *.jpg *.png.

    convert’s syntax format is as follows: convert inputFileName [options] outputFileName

  4. Improve brightness/contrast of the image: convert -brightness-contrast 20x8 myImage.jpg output.jpg

  5. Resize an image: convert -resize 800x600 myImage.jpg output.jpg, convert -resize “50%” myImage.jpg Backup/resizeMyImage.jpg (resize an image by percentage and save it on another folder).

  6. Blur images: convert -blur 2x3 myImage.jpg output.jpg

  7. Add text: convert -font Helvetica -fill white -gravity SouthEast -annotate +0+10 ‘The bridge’ bridge.jpg output.jpg (gravity SouthEast moves the text to the bottom right of the image, font renders text with a particular font, fill defines the color).

  8. Swirl images pixels about the center: convert -swirl 180 myImage.jpg output.jpg

  9. We can use scripts for batch-processing of the images.

        for j in *.jpg
        do 
             convert -monochrome "$j" altered_"$j"
        done

Deepin Scrot is GNU/Linux Deepin’s screenshot program: scrot myScreenshot.png (it takes a screenshot of the entire screen), scrot -s myScreenshot.png (it takes a screenshot of an specific area).

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