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To use paint tools on images, follow the steps given below:
              Step 1:  In the toolbox of GIMP, select the paint tool
                       icon. The paint tool can also be selected by
                       clicking the desired Paint tool after choosing
                       Tools from the program’s menu.
              Step 2:  From  the  GIMP  menu,  select  File  and  then
                       New to create a canvas. An image can also
                       be painted over. To open an image from the
                       computer drive, select File and then Open.
                       Drag the paint tool icon on the GIMP canvas
                       while holding down the left mouse button. In
                       order to make tool strokes like pencil, brush,
                       eraser,  etc.,  a  tiny  circle  will  appear  above
                       your mouse cursor on the GIMP canvas.

              Step 3:  Click  the  colour  box,  which  is  situated
                       immediately beneath the tool icons in GIMP’s
                       toolbox,  to  select  the  colour  for  your  paint
                       tool. By default, the colour is black, but you
                       can alter it by selecting one of the square colour samples or by using the gradient sliders.
              Step 4:  You can configure the pencil, brush, eraser, and other paint tool options. When the paint tool is selected,
                       these choices are displayed on the lower part of the GIMP toolbox. To change the transparency of the painting
                       brush, move the Opacity slider. For various paint tools, one can modify characteristics like size, aspect ratio,
                       and angle.
              The Paint Tools listed below are assistive painting tools. With the aid of these tools, the painter can create smooth
              transitions or add specific effects to the artwork.

                   Clone               Recreates portions of the picture
                   Bucket Fill         It fills an area with a selected color or pattern.

                   Gradient            It fills an area with a gradient.
                   Pencil              It paints lines with hard edges; that is, the pixels are not anti-aliased.

                   Paintbrush          It paints lines with soft or fuzzy edges; that is, the pixels are anti-aliased and/or feathered.
                   Eraser              It erases pixels of an image from the current layer
                   Airbrush            It is a paint tool with variable pressure.
                   Ink                 It paints anti-aliased lines with a simulation of a nib.

                   My Paint Brush      It allows you to create fuzzy brush strokes over existing images or a blank virtual canvas.
                   Clone               The Clone Tool in GIMP allows you to copy pixels from one part of an image to another.

                   Heal                Eliminates specks from photographs
                   Perspective Clone   Recreates portions of a picture while maintaining perspective.
                   Blur/Sharpen        The Blur/Sharpen Tool in GIMP allows you to selectively make areas vague or enhance them
                                       in an image.
                   Smudge              Smears and produces smooth object changes

                   Dodge/Burn          Lightens or darkens specific portions of a picture


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