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Pencil Tool

                  Pencil Tool creates freeform lines like a normal pencil and uses the foreground colour. It is like a virtual
                  pencil that you can use to create designs or lines with options to change the colour, opacity, intensity
                  and pencil diameter. It also works with various modes to enhance the outlook of your project and
                  create unique design artworks that look like hand-drawn images. Follow the below steps to use the
                  Pencil Tool:

                  Step 1:  Open a new or an existing Photoshop document.
                  Step 2:  Click on the Pencil Tool in the Tools panel.
                  Step 3:  Go to the Brush Preset Panel to modify the size and shape of the Pencil Tool.
                  Step 4:   Click and drag on the canvas or the image to draw. You can also try different Modes available
                          in Options bar.

                       Color Replacement Tool

                  Color  Replacement Tool replaces  the original  colour of an image  (through sampling)  with the
                  foreground colour. By  specifying  different sampling methods,  limits  and tolerance  settings  in the
                  Options bar, you can control the range of colours that Photoshop replaces. The mouse pointer will
                  change into a circle with a small plus sign ‘+’ in the centre called crosshair. Follow the below steps to
                  use the Color Replacement Tool:

                  Step 1:   Open an image in which you want to change the colour of an object. For example, the red
                          apple.
                  Step 2:   Click on the Color Replacement Tool in the Tools panel and select green as foreground color.
                  Step 3:  Select the desired brush tip, size, hardness, modes, limits, etc., from the Options bar.
                  Step 4:   Move the crosshair over the object (red apple) in the image and click. As soon as you click,
                          Photoshop samples the object’s colour (red) under the crosshair. Now, it knows which colour
                          to replace. The colour under crosshair changes into green (foreground colour).
                  Step 5:   Just click and drag the mouse button over the
                          remaining areas to change the rest of the colour.
                          Do not move the crosshair away from the object.
                          Otherwise, it will sample the colour of the area
                          outside your object and will start changing it to
                          foreground colour as well. If you do so by mistake,        Using Color Replacement Tool
                          you can just undo.

                  Sampling Continuous replaces all the colour with the foreground color.  Sampling Once changes
                  colour which you first click. Sampling Background Swatch replaces the colour of the object into the
                  background color. You can select your desired blend mode from Color, Hue, Saturation and Luminosity.

                  Contiguous  Limit replaces the colour of neighbouring  pixels containing  the sampled  colour.
                  Discontiguous Limit replaces the colour of the pixels containing the sampled colour, whether or not
                  they are close by. Tolerance refers to a range of colour. A high tolerance lets you replace a broad
                  range of colours. A low tolerance limits the replacement of colour to only areas that are similar to the
                  sampled colour. Anti-aliasing softens and smoothens the edge of the sampled areas slightly.


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