How to edit images in ubuntu Linux using Kolourpaint application and apply various image enhancement operations

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Kolourpaint is a simple, easy-to-use painting application for the KDE desktop environment. It's similar to Microsoft Paint, offering basic image editing and drawing tools. Even though Kolorpaint is part of KDE, it can be installed and used on other desktop environments like GNOME (which Ubuntu typically uses).Kolorpaint is a handy tool for basic image editing and quick sketches.



Installing Kolourpaint on Ubuntu:

Use the terminal command to install application sudo apt install kolourpaint

Features of Kolorpaint:

  • Basic drawing tools: Pen, line, rectangle, ellipse, and more.
  • Fill tool: For filling areas with a solid color.
  • Image editing: Resize, crop, and rotate images.
  • Text tool: Add text to your images.
  • Colors and palettes: Choose from a variety of colors to use in your designs.
  • Undo/Redo: Support for multiple undo/redo actions.

Image edit Operations

Autocrop / Remove Internal Border

This automatically removes the border of an image or selection. Use Autocrop if you have a figure that does not fill the entire image or selection and you wish to remove the excess whitespace. To use this feature with a dithered image border, you will also need to use Color Similarity

Flip (upside down)

This flips the entire image or selection vertically.


Resize Scale

Resizing the image changes the dimensions of the image without applying a transformation to the existing contents. Scaling the image will stretch the existing contents to the new dimensions.



Rotate

This rotates the image. You can specify the angle(90,180,270 in degree,custom) for rotation with direction clockwise and anticlockwise.it also supports Rotate operation to:LEFT, RIGHT






Skew

The skew operation on an image refers to a transformation that distorts or slants the image along either the horizontal or vertical axis, or both. Unlike rotation (which turns the image), skewing shifts parts of the image in one direction, creating a "tilted" or "slanted" effect without changing the actual orientation.

  • Horizontal skew: Moves the image's top and bottom edges horizontally, while the vertical edges remain straight. This makes the image appear as if it's slanted sideways.
  • Vertical skew: Moves the image's left and right edges vertically, while the horizontal edges remain straight. This gives the image an appearance of being tilted upward or downward.


    • Mirror (horizontally)

    This mirrors the entire image or selection horizontally.


    Reduce to Monochrome (Dithered)

    This reduces the entire image or selection to black and white.


    Reduce to Grayscale

    This reduces the entire image or selection to grayscale.


    Make image confidential

    Allows to hide Image content


    Invert Colors

    This allows you to invert one or more RGB channels in the image or selection. Select All to change a photo into a negative and vice versa.


    Balance

    This allows you to set the brightness, contrast and gamma of the image or selection.


    Emboss

    Check Enable to apply the Emboss effect. This emphasises the edges and gives the image or selection an "engraved look".


    Flatten

    This recolors the image with varying shades of the two selected colors.


    Histogram Equaliser

    Allows to edit image granularity and histogram parameters


    Hue, Saturation, Vue

    Allows to edit HSV values from image


    Invert

    This allows you to invert one or more RGB channels in the image or selection. Select All to change a photo into a negative and vice versa.


    Reduce Colors

    This reduces the number of colors used by the image or selection, with or without dithering. Dithering generally provides better quality results, however, you may wish to disable it for artistic effects; e.g. using Monochrome instead of Monochrome (Dithered) gives a silhouette effect. Another important distinction is that while Monochrome (Dithered) will always reduce the entire image or selection to black and white, Monochrome will do this only if the image or selection contains more than 2 colors.


    Soften & Sharpen

    Use this effect to soften or sharpen the image.


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    Thanks for your valuable input