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Trapezium crop
Dawson from Malaysia  [173 posts]
5 years
Hi STeven,

Is it possible to crop trapezium shapes? As the area gets smaller due to perspective, i think it would be useful to be able crop trapezium shapes in addition to rectangular shapes.
Dawson from Malaysia  [173 posts] 5 years
sorry let me elaborate, as the distance gets further the object or scene (like a road or pavement or corridor) gets smaller due to perspective.
Anonymous 5 years
As images cannot exist outside of the rectangular shape unless they have a mask or alpha channel I'm not sure what is achieved by doing this. You can always zero out parts of an image by ANDing it with a mask that is white where you want parts to go through and black where you do not. But when it comes to the actual shape of an image ultimately they have to be rectangular ... but the content within can be styled in any direction.

STeven.
Dawson from Malaysia  [173 posts] 5 years
Thanks. ANDing the image with a mask should do the job.
Dawson from Malaysia  [173 posts] 5 years
On the other-hand if i applied a mask and did an edge detection, the edges of the mask will also be detected. Could i apply an alpha channel instead?
Anonymous 5 years
Apply the mask AFTER the edge detection.

:-)

STeven.
Dawson from Malaysia  [173 posts] 5 years
Yes you are right :D (i initially thought i could not follow that sequence..... but on second thought i probably can)

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