I'd love a checkbox for 'output size equals input' on patches to avoid the crop dance.
Keith On Thursday, September 8, 2011 at 8:59 AM, George Toledo wrote: > That is a side effect from the gaussian kernel. > > If you look at look at a simpler blur kernel, like a box blur, you will see > that you take multiple samples of an image, and offset them by a pixel (or > more) up/down/left/right and blend together. If one does this, the actual > edges of the image end up having a kind of edge because there aren't pixels > available "outside the bounds" of the image for the blur kernel to work on. > Also, because one has kind of created and shifted these multiple planes of > image data up/down/left/right, your image extents will now be larger. This is > really easy to see with a simple box blur (each sample), but this is > basically what you're seeing with the gaussian blur as well. > > One easy route to a fix would be for you to just use the "blur" composition > that is in your patch list (if you're using 10.6+). Also, If you have this, > look for the source file at the location described in the patch list, and > examine the process that is taken in that composition to properly setup the > image to be cropped. If you follow that pattern for other core image kernels > that have this kind of side effect, you will be pretty solid most of the > time. Usually, one uses a crop patch referenced to the image dimensions of > the source, and sometimes incorporates something like an affine clamp to > extend the image if needed. > > > On Thu, Sep 8, 2011 at 11:42 AM, Sebastian Mecklenburg <s...@happyhappyboy.de > (mailto:s...@happyhappyboy.de)> wrote: > > Hello, > > > > OK, I'm getting closer. I have my shape generator up and running and it > > looks fine. > > However, I created my image just big enough to contain my shape, so when I > > apply an image effect like "Blur" the image appears to be cropped. I think, > > the image should be extended so it can fully contain the blur halo. Is this > > something I have to take into account as a programmer or is this the > > expected behavior and the user has to deal with it? I noticed that the > > "Gaussian Blur" effect seems to shrink the image to be blurred beforehand > > to make room for the blur halo, but I don't like that. > > > > Thanks and regards, > > Sebastian Mecklenburg > > > > > > _______________________________________________ > > Do not post admin requests to the list. They will be ignored. > > Quartzcomposer-dev mailing list (Quartzcomposer-dev@lists.apple.com > > (mailto:Quartzcomposer-dev@lists.apple.com)) > > Help/Unsubscribe/Update your Subscription: > > http://lists.apple.com/mailman/options/quartzcomposer-dev/gtoledo3%40gmail.com > > > > This email sent to gtole...@gmail.com (mailto:gtole...@gmail.com) > > > > -- > George Toledo > gtole...@gmail.com (mailto:gtole...@gmail.com) > www.georgetoledo.com (http://www.georgetoledo.com) > > > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Quartzcomposer-dev mailing list (Quartzcomposer-dev@lists.apple.com > (mailto:Quartzcomposer-dev@lists.apple.com)) > Help/Unsubscribe/Update your Subscription: > http://lists.apple.com/mailman/options/quartzcomposer-dev/songcarver%40gmail.com > > This email sent to songcar...@gmail.com (mailto:songcar...@gmail.com)
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