Figure 5-3 demonstrates the transparency modes. In the first example (1a), the transparency mode for both the source image and the pattern is transparent. Since the source mode is “transparent,” only the non-white region (the circle) of the source image is overlaid on the destination. Since the pattern mode is also transparent, the patterned source image is applied only to the white areas of the destination.
In the second example (1b), the source mode is still “transparent,” but the pattern mode is “opaque” – so the pattern's white pixels are applied to the destination. The resulting image shows the entire circle region visible and patterned.
In the third example (1c), the source mode is “opaque” and the pattern mode is transparent. Since the source mode is opaque, the entire source image (the circle and the surrounding square) appears overlaid onto the destination. The pattern, however, is allowed to pour through only onto the white-pixeled area of the destination. The circle is visible in the result, but only two opposing quarters appear patterned.
In the fourth example (1d), both source and pattern modes are “opaque.” The entire source image is overlaid onto the destination, and the entire circle is patterned.
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