danieldresser-ie
commented
2 years ago Discussed with Brendan, and it sounds like this network addresses his issue. Not sure if this is something that is worth building into core. The far more complicated case would be if you wanted to address borders that were more than a fractional pixel, which would require outputting a different data window.
import GafferImage
import imath
Gaffer.Metadata.registerValue( parent, "serialiser:milestoneVersion", 0, persistent=False )
Gaffer.Metadata.registerValue( parent, "serialiser:majorVersion", 60, persistent=False )
Gaffer.Metadata.registerValue( parent, "serialiser:minorVersion", 77, persistent=False )
Gaffer.Metadata.registerValue( parent, "serialiser:patchVersion", 0, persistent=False )
__children = {}
__children["ImageTransform"] = GafferImage.ImageTransform( "ImageTransform" )
parent.addChild( __children["ImageTransform"] )
__children["ImageTransform"].addChild( Gaffer.V2fPlug( "__uiPosition", defaultValue = imath.V2f( 0, 0 ), flags = Gaffer.Plug.Flags.Default | Gaffer.Plug.Flags.Dynamic, ) )
__children["Unpremultiply"] = GafferImage.Unpremultiply( "Unpremultiply" )
parent.addChild( __children["Unpremultiply"] )
__children["Unpremultiply"].addChild( Gaffer.V2fPlug( "__uiPosition", defaultValue = imath.V2f( 0, 0 ), flags = Gaffer.Plug.Flags.Default | Gaffer.Plug.Flags.Dynamic, ) )
__children["DeleteChannels"] = GafferImage.DeleteChannels( "DeleteChannels" )
parent.addChild( __children["DeleteChannels"] )
__children["DeleteChannels"].addChild( Gaffer.V2fPlug( "__uiPosition", defaultValue = imath.V2f( 0, 0 ), flags = Gaffer.Plug.Flags.Default | Gaffer.Plug.Flags.Dynamic, ) )
__children["Shuffle"] = GafferImage.Shuffle( "Shuffle" )
parent.addChild( __children["Shuffle"] )
__children["Shuffle"]["channels"].addChild( GafferImage.Shuffle.ChannelPlug( "channel", flags = Gaffer.Plug.Flags.Default | Gaffer.Plug.Flags.Dynamic, ) )
__children["Shuffle"].addChild( Gaffer.V2fPlug( "__uiPosition", defaultValue = imath.V2f( 0, 0 ), flags = Gaffer.Plug.Flags.Default | Gaffer.Plug.Flags.Dynamic, ) )
__children["ImageTransform"]["in"].setInput( __children["Shuffle"]["out"] )
__children["ImageTransform"]["transform"]["translate"].setValue( imath.V2f( 0.5, 0.5 ) )
__children["ImageTransform"]["__uiPosition"].setValue( imath.V2f( 247.807846, 32.1879387 ) )
__children["Unpremultiply"]["in"].setInput( __children["ImageTransform"]["out"] )
__children["Unpremultiply"]["channels"].setValue( '*' )
__children["Unpremultiply"]["alphaChannel"].setValue( '__borderMask' )
__children["Unpremultiply"]["__uiPosition"].setValue( imath.V2f( 247.798447, 24.0238876 ) )
__children["DeleteChannels"]["in"].setInput( __children["Unpremultiply"]["out"] )
__children["DeleteChannels"]["channels"].setValue( '__borderMask' )
__children["DeleteChannels"]["__uiPosition"].setValue( imath.V2f( 247.798447, 15.859849 ) )
__children["Shuffle"]["channels"]["channel"]["out"].setValue( '__borderMask' )
__children["Shuffle"]["channels"]["channel"]["in"].setValue( '__white' )
__children["Shuffle"]["__uiPosition"].setValue( imath.V2f( 247.816574, 40.3520012 ) )
del __children
Some of our clients require specific transform nudges to the frame when following a camera extraction workflow (going from a full-sized plate to 1920x1080 editorial framing). Gaffer's image transform filtering results in some border effects on the frame edge since it’s surrounded by black pixels.
e.g. Translating an image by -5.5 pixels in X results in a dark band on the right-hand border.
Currently our workaround is to mirror a copy of the image along the affected edge before doing the transform, then crop off the excess.
Could you please add some boundary conditions (duplicate/mirror/wrap or whatever matches the behavior of other nodes) to ImageTransform to help automatically suppress those artifacts?