filling a feathered horse and rider selection with red, yellow and white, each time with lower feather values, and setting the layer to Screen Mode. The G imp Us e r’s Man u al 3 5 C h a p ter 3 Adding Motion the background. To make the car stand out more in the overall composition, contrast and brightness values were increased. Two photographs from the service manual were then pasted to a layer with low opacity alphachannel(aconvenientfeatureforcreatingtransparent GIFs). For now, let’s stick to the default values; just click on OK. Now you have a work- space to work in. Close the image by choosing right-click|File|Close

will be somewhat noticeable, but the image will be fine as long as its not inspected too closely. Values lower than 100 are visibly coarse and should only be used for material that is seen from a distance as JPEG” dialog that contains the quality control. The “Export Image as JPEG” dialog uses default values that reduce size in memory while retaining good visual quality; this is the safest and quickest thing point is represented by a brightness value, ranging from 0 (black) to 255 (white), with intermediate values representing different levels of gray. Figure 5.1 Components of the RGB and CMY Color Model (a)

selection channel the value denotes how strong the pixels are selected and in the alpha channel the values denote how transparent the corresponding pixels are. Selections Often when you do something to an displayed in grayscale. Again, if you’re interested in some detail, this is achieved by taking the RGB values at the pixels in your image, and suitably weighted averaging them to get an intensity at that point point is represented by a brightness value, ranging from 0 (black) to 255 (white), with intermediate values representing different levels of gray. Figure 5.1: Components of the RGB and CMY Color Model (a)

point is represented by a brightness value, ranging from 0 (black) to 255 (white), with intermediate values representing different levels of gray. Essentially the difference between a grayscale image the layer is opaque, and the color is determined by the color of the layer. Intermediate alpha values correspond to varying degrees of translucency: the color at the location is a proportional mixture d f In Gimp, every color channel, including the alpha channel, has a range of possible values from 0 to 255; in computing terminology, a depth of 8 bits. Some digital cameras can produce image

box shows histogram of colour value usage – Useful to display a Logarithmic histogram so that values aren’t hidden at the bottom of the graph Colour Levels Display Logarithmic Histogram The middle