FixLuminance
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Raffriff42 (Talk | contribs) (Examples w/ images) |
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{{Template:FuncDef|FixLuminance(clip ''clip'', int ''intercept'', int ''slope'')}} | {{Template:FuncDef|FixLuminance(clip ''clip'', int ''intercept'', int ''slope'')}} | ||
Revision as of 02:53, 25 January 2016
Deprecated: see discussion
FixLuminance(clip clip, int intercept, int slope)
- int intercept = (required)
- Line at which to start correction.
- int slope = (required)
- Slope of correction function. The top of the picture is made darker by 1 (on a 0-255 scale) every slope lines.
- Maximum darkening (at top line) = intercept / slope
The purpose of this filter is to progressively darken the top of the image; for example, to compensate for certain VCRs which make the top of each frame brighter than the bottom. This filter works only with YUY2 input.
Examples
- Progressively darken top lines.
ColorBars(pixel_type="YUY2") Crop(0, 0, 0, 256) FixLuminance(100, 4)
Line 99 is normal; line 0, the topmost line, is darker by 25 (intercept/slope = 100/4 = 25)
- Make a ramp test image.
BlankClip(height=256, pixel_type="YUY2", color_yuv=$ff8080) FixLuminance(255, 1)
