Using Filters to Color and Bleach an Image

Some filters offer the option to subsequently color your image, give it a vintage feel, and make it look like a pencil drawing or convert it into a grayscale photocopy.

An interesting filter to color images can be found under Filters > Decor > Old Photo. This filter can create more than just a sepia-toned photo. If desired, the image can be altered with various effects to give it an aged look. However, this script-fu doesn't have a preview function. You just have to activate or deactivate the various check boxes and see what the outcome is. I'll leave it to you to experiment with this filter.

Another filter that is installed in GIMP alters your picture, both color or black and white, into a grayscale image with great effects. It is the Photocopy filter (Filters > Artistic > Photocopy). The application is so easy that you should try it out.

You can also find a wonderful filter called Pencil drawing from photo that alters a picture (both black-and-white and color), as the name implies, into a pencil drawing. But note that this script-fu works only on images in RGB mode. You can find it on the website GIMP Plug-ins Registry (http://registry.gimp. org/node/11108) or on this book's DVD under Script-Fus.

Another grayscale filter that creates images that look like drawings is Quick sketch (http://registry. gimp.org/node/5921). This is also a so-called script-fu. One of the sliders controls the display. Try it!

When installed, the Pencil drawing from photo and Quick sketch script-fus create new entries in the menu of the image window.

Figure 4.36

The window of the Photocopy filter (Filters > Artistic >Photocopy) with all the possible settings

4.4 COLORING GRAYSCALE IMAGES

Figure 4.37

The Pencil Drawing From Photo script-fu dialog with its basic settings and the outcome of applying it.

Figure 4.37

The Pencil Drawing From Photo script-fu dialog with its basic settings and the outcome of applying it.

Gimp Sketch Effect Script

Figure 4.38

The script-fu Quick Sketch dialog. Here is the result after applying a value of 35.

Figure 4.38

The script-fu Quick Sketch dialog. Here is the result after applying a value of 35.

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