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To reduce pixel depth in an image
-
Open the image or frame you want to convert.
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Choose Palette > Set Pixel Depth and select a choice from the submenu (Figure 1). Table 1 shows how pixel depth relates to the number of colors in an image.
If the
Palette Commands toolbar is active, you also can click 
.
-
Release the cursor and the image is converted to the pixel depth you chose.
Figure 1 To reduce pixel depth in an image, choose Palette > Set Pixel Depth and select a choice from the submenu. (In this case, the Mac menu appears on the left and the Windows one on the right.)
| Pixel (Bit) depth and number of colors | ||
|
HUNDREDS OF COLORS—INDEXED TO A PALETTE |
||
|
1 bit 2 bits 3 bits 4 bits 5 bits 6 bits 7 bits 8 bits |
2 colors 4 colors 8 colors 16 colors 32 colors 64 colors 128 colors 256 colors |
|
| THOUSANDS OF COLORS—NOT INDEXED TO A PALETTE | ||
|
15 bits 16 bits |
32,768 colors 32,768 colors + |
RGB |
| MILLIONS OF COLORS—NOT INDEXED TO A PALETTE | ||
|
24 bits 32 bits |
17 million colors 17 million colors |
RGB RGB or CMYK + |