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| == Graphic filters ==
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| ScummVM offers several anti-aliasing filters to attempt to improve visual
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| quality. These filters take the original game graphics, and scale it by a
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| certain fixed factor (usually 2x or 3x) before displaying them to you.
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| So for example, if the game originally ran at a resolution of 320x200
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| (typical for most of the SCUMM games), then using a filter with a scale
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| factor of 2x will effectively yield 640x400 graphics. Likewise a
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| 3x filter will give 960x600.
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| ScummVM uses the following graphic filters:
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| {|class="wikitable"
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| |-
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| ! Name
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| ! Factor
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| ! Description
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| |-
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| | 1x
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| | 1x
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| | No filtering, no scaling, fastest
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| |-
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| | 2x
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| | 2x
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| | No filtering, simple pixel duplication (default for non 640x480 games)
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| |-
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| | 3x
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| | 3x
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| | No filtering, simple pixel duplication
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| |-
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| | 2xsai
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| | 2x
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| | SAI filter
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| |-
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| | super2xsai
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| | 2x
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| | Enhanced 2xSAI filtering
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| |-
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| | supereagle
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| | 2x
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| | Less blurry than 2xSAI, but slower
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| |-
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| | advmame2x
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| | 2x
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| | Doesn't rely on blurring like 2xSAI, fast
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| |-
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| | advmame3x
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| | 3x
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| | Doesn't rely on blurring like 2xSAI, fast
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| |-
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| | hq2x
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| | 2x
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| | Very nice high quality filter but slow
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| |-
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| | hq3x
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| | 3x
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| | Very nice high quality filter but slow
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| |-
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| | tv2x
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| | 2x
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| | Interlace filter, tries to emulate a TV
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| |-
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| | dotmatrix
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| | 2x
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| | Dot matrix effect
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| |}
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| To select a graphics filter from the command line, use the '-g' option (see [[User Manual/Appendix: Command line options|Command line options]]), e.g.:
| | == Comparison == |
| | === Monkey Island 2 (256 colors) === |
| | <gallery caption="1X scalers" widths="65px" heights="70px" perrow="4"> |
| | Image:MonkeyIsland2_part_Normal.png|Normal (no scaling) |
| | </gallery> |
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| <pre>scummvm -gadvmame2x monkey2</pre> | | <gallery caption="2X scalers" widths="130px" heights="140px" perrow="4"> |
| | Image:MonkeyIsland2_2X.png|2X |
| | Image:MonkeyIsland2_TV2x.png|TV2x |
| | Image:MonkeyIsland2_AdvMAME2x.png|AdvMAME2x |
| | Image:MonkeyIsland2_2xSAI.png|2xSAI |
| | Image:MonkeyIsland2_Super2xSAI.png|Super2xSAI |
| | Image:MonkeyIsland2_SuperEagle.png|SuperEagle |
| | Image:MonkeyIsland2_HQ2x.png|HQ2x |
| | Image:MonkeyIsland2_DotMatrix.png|DotMatrix |
| | </gallery> |
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| There is always a speed impact when using any form of anti-aliasing/linear filtering. Filters can be especially slow when ScummVM is compiled in a debug
| | <gallery caption="3X scalers" widths="195px" heights="210px" perrow="3"> |
| configuration without optimizations. For these reasons, not all backends support all (or even any) of the filters listed above;
| | Image:MonkeyIsland2_3X.png|3X |
| some may support additional ones. The filters listed above are those supported by the default SDL backend.
| | Image:MonkeyIsland2_AdvMAME3x.png|AdvMAME3x |
| | | Image:MonkeyIsland2_HQ3x.png|HQ3x |
| ''Note 1'': The final resolution depends on the original resolution of the game you are playing. For example, the FM-TOWNS version of Zak McKracken uses an original resolution of 320x240, hence for this game the final resolution with a scaler will be 640x480 (2x) or 960x720 (3x).
| | </gallery> |
| Likewise, games that were originally 640x480 (such as Curse of Monkey Island or the Broken Sword games) will be scaled to 1280x960 (2x) and 1920x1440 (3x).
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| ''Note 2'': When setting a graphic filter in the general ScummVM options it only applies to the games that have a low original resolution (e.g. 320x200 or 320x240). To use a graphic filter with a game that has a higher original resolution (e.g. 640x480) you need to specifically set the graphic filter in the settings for that game.
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