Editing Apple IIGS (section)

=== Graphics ===
{{unreferenced section|date=December 2016}}
In addition to supporting all the text and bitmapped [[Apple II graphics]] modes of earlier models, the Apple IIGS's Video Graphics Chip (VGC) introduced a new "Super-High Resolution" mode with a vastly wider color palette and no [[Composite artifact colors|color bleeding and fringing]]. Super-High-Resolution supports 200 lines, in either 320 or 640 pixels horizontally. Both modes use a [[List of monochrome and RGB color formats#12-bit RGB|12-bit palette]] for a total of 4,096 possible colors. There can be between 4 and 3,200 colors onscreen at once, with no more than 16 per line. A ''fill mode'' setting allowing fast solid-fill graphics by automatically repeating a pixel's color to the right along the same scan line&mdash;until a different color pixel is reached.

Each row of the display can independently select either 320 or 640 pixels, fill mode (320 pixels only), and any of the 16 palettes. These settings provide many possibilities:

* 320×200 pixels with a single palette of 16 colors.
* 320×200 pixels with up to 16 palettes of 16 colors. The VGC holds 16 separate palettes of 16 colors in its own memory. Each of the 200 scan lines can be assigned any one of these palettes, allowing for up to 256 colors on the screen at once.
* 320×200 pixels with up to 200 palettes of 16 colors. The CPU assists the VGC in swapping palettes into and out of the video memory so that each scan line can have its own palette of 16 colors, allowing for up to 3,200 colors on the screen at once.
* 320×200 pixels with 15 colors per palette, plus a fill-mode color. Color 0 in the palette is replaced by the last non-zero color pixel displayed on the scan line (to the left).
* 640×200 pixels with 4 pure colors.
* 640×200 pixels with up to 16 palettes of 4 pure colors. The VGC holds 16 separate palettes of 4 pure colors in its own memory. Each of the 200 scan lines can be assigned any one of these palettes, allowing for up to 64 colors on the screen at once.
* 640x200 pixels with up to 200 palettes of 4 pure colors. The CPU assists the VGC in swapping palettes into and out of the video memory so that each scan line can have its own palette of 4 colors, allowing for up to 800 colors on the screen at once.
* 640×200 pixels with 16 dithered colors. Two palettes of four pure colors each are used in alternating columns. The hardware then dithers the colors of adjacent pixels to create 16 total colors on the screen.