Question about masking images and soft edges

[ethorneloe]

Hi,

I have been reading the Quartz 2D Programming Guide on creating image masks, but I can't seem to find anything about how to create soft edges. All the shape and path drawing examples seem to always have hard edges. Does anyone know of a way to paint shapes and create masks that have soft edges? Basically the effect I'm looking for is the same as if you were in Photoshop and used a soft brush to paint a circle, and the edges of the circle are soft and semi-transparent.

thanks

[baja_yu]

Whatever is black in the image will be visible and whatever is white will be invisible. Everything in between will be partly visible. So take a hint from that. If you have an image of 100x100 and draw a 50px radius circle and fill it black, after that draw a 51px circle (without fill) that is 70% black, then 52px at 40% black or something to that effect. Those two will be partially visible and will give an effect of a soft edge.

[ethorneloe]

Thanks for the reply.

I'll give that a go. Was hoping there was something in an API that would enable painting with soft edges, and that I just wasn't finding it.