[Bf-compositor] [bug] filter an image after a transform node

[Francesco Paglia]

Hi Bartek,
thanks for your reply,
despite I imagined the solution you kindly gave me, I wanted just notice
the behavior, I hope this will be solved when canvas will be "introduced".

Again,
thanks,
Francesco




2014-04-28 9:06 GMT+02:00 Bartek Skorupa (priv) <
bartekskorupa at bartekskorupa.com>:

> The tools for transformations in compositor are tricky.
> When you use "Transform" node or "Scale" node with "Relative" or
> "Absolute" option you'll never get canvas bigger then original dimensions
> of input image.
> In fact you'll also not get smaller canvas when you scale the image down.
> outer parts of the image will be filled with black.
> You can set scale to 2.0 let's say and the image will get scaled up and
> cropped. However this cropping is kind of not destructive.
> Try this:
> Scale the image up using "relative" option setting scale to 2.0
> Then scale down the result to 0.5.
> You'll get the original image back, although when looking at the result of
> first scale node - you see cropped image. Second scale node brings cropped
> pixels back.
> The only way to get really scaled up image is to use "Scale" node and set
> it to "Render size". This way the canvas will get resized as well.
> There is unfortunately no easy way to resize images.
> I didn't yet find any whatsoever way to scale image up to different then
> render size dimensions.
> There's nothing wrong with filer of blur nodes. The problems are cased by
> scaling that is far from being intuitive. A lot of tricks need to be
> performed to make it work.
>
>  Bartek Skorupa
>
> www.bartekskorupa.com
>
> On 26 kwi 2014, at 11:53, Francesco Paglia <f.paglia.80 at gmail.com> wrote:
>
> Hi everyone,
> I don't know if its already a known bug or not.
> I noticed that if I add a filter node on an image picture  (in this case I
> used a sharpen but I could have added a blur as well) that has been scaled
> via a transform node it gets cropped to its original canvas.
>
>
> https://lh3.googleusercontent.com/-Ofe6M4zczAU/U1t_TmuBMzI/AAAAAAAAJKE/Vj8V6Ni2D44/w1293-h808-no/sharpernerror.jpg
>
> Step to reproduce:
> import an image (smaller than the render output to notice it)
> add a distort\transform node
> scale the image
> add a filter\blur or filter\filter node
> the image get cropped to the original canvas (at least it seems so)
>
> this append with 2.70a as well as with the build I downloaded the 25th
> april hash 3b75d6c
>
>
>
> --
> Francesco Paglia
> Vfx and Production Supervisor
>
> mobile  +39 347.82.12.473
> e-mail   f.paglia.80 at gmail.com
>
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-- 
Francesco Paglia
Vfx and Production Supervisor

mobile  +39 347.82.12.473
e-mail   f.paglia.80 at gmail.com
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