 | | Re: img2sticker: Convert images into .ldr stickers
|
|
(...) I suspect that using this would be risky. My program actually implements a find-nearest colours routine but when dealing with aliased images, often the aliasing will come out to be grey, dark grey or even weirder colours (I match in HSV space (...) (19 years ago, 29-Jun-05, to lugnet.cad, FTX)
|
| |
| | Re: img2sticker: Convert images into .ldr stickers
|
|
(...) Just as a note, it's actually antialiasing, not aliasing. Aliasing (aka jaggies) is the problem that antialiasing solves. And you're right; it's very difficult to undo normally. On the other hand, for images that stickers are likely to be made (...) (19 years ago, 30-Jun-05, to lugnet.cad, FTX)
|
| |
| | Re: img2sticker: Convert images into .ldr stickers
|
|
(...) I did know that ;-) (and checked through all documents to make sure I had it right). I blame it on posting too long after I'd turned into a pumpkin. The thing is, anti-aliasing should be invertible if you know the routine used to perform it in (...) (19 years ago, 30-Jun-05, to lugnet.cad, FTX)
|
| |
| | Re: img2sticker: Convert images into .ldr stickers
|
|
(...) Hmm, I don't think so. Traditional antialiasing spreads the partial pixel errors from a line (or edge) into the adjacent pixels. In order to undo it you'd need to know where the line is, but that's the very information you're trying to recover (...) (19 years ago, 30-Jun-05, to lugnet.cad, FTX)
|
| |
| | Re: img2sticker: Convert images into .ldr stickers
|
|
(...) Strictly speaking though, (almost) any filter is invertible. Of course you do need to know what the original filter was which is easier said than done. (...) Although it even worse as the image has been stored a a jpeg which bleeds the colours (...) (19 years ago, 30-Jun-05, to lugnet.cad, FTX)
|
| |
| | Re: img2sticker: Convert images into .ldr stickers
|
|
(...) Yeah, but if you think of line antialiasing as a sort of blur filter, you'll notice the convolution kernel is directional. The blurring occurs perpendicular to the direction of the line. This implies a different filter for each line segment on (...) (19 years ago, 30-Jun-05, to lugnet.cad, FTX)
|
| |
| | Re: img2sticker: Convert images into .ldr stickers
|
|
(...) That may be true, but antialiasing isn't a filter in that sense. When applied to computer-generated graphics, it's calculated during rendering using information that isn't available in the final image. When aplied during image scaling (...) (19 years ago, 30-Jun-05, to lugnet.cad, FTX)
|
