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Clarify documentation of rgbgfx -C/--color-curve #1864

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Clarify documentation of rgbgfx -C/--color-curve #1864

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12 changes: 9 additions & 3 deletions man/rgbgfx.1
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Expand Up @@ -143,9 +143,15 @@ Set the base IDs for tile map output.
should be one or two numbers between 0 and 255, separated by a comma; they are for bank 0 and bank 1 respectively.
Both default to 0.
.It Fl C , Fl \-color-curve
When generating palettes, use a color curve mimicking the Game Boy Color's screen.
The resulting colors may look closer to the input image's
.Sy on hardware and accurate emulators .
When outputting palettes, apply a color curve mimicking the Game Boy Color's screen.
This modifies the
.Em absolute
RGB color values so that the
.Em perceived
colors, when displayed on Game Boy Color hardware
.Pq or an emulator with an accurate display filter ,
will look like the original colors as displayed on a backlit computer screen.
Note that GBC displays can look very different depending on the ambient light and their exact hardware model, so this color curve is only a "best effort".
.It Fl c Ar pal_spec , Fl \-colors Ar pal_spec
Use the specified color palettes instead of having
.Nm
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