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cinemino

Feather Texturing

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"I disagree. The info in this thread is helping cinemino work out how to get the result he needs"

Possibly , but there is so far not a single answer that will make it work as it should.

There is a reason for straight alphas. not understanding it and how to produce it will only lead to further confusion

as of why different kinds of fringing occurs.

Cheers

Lennart

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Well i can save every kind of image by photoshop so if you tell me the better way is save a TIF becouse it is better i save a TIF, if you advise me to save in PNG i'll do.

What is the easy way? Create just an image like PNG with transparent background? or create JPG color and JPG for Alpha channel?

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Is it something like this that you're after? This was just a quickie so it could use some work but I think you'll get the idea. Seems to be some dispute in this thread as to the correct way to go about this, so I shall call this 'just one way of skinning a cat'.

Cheers

Karl

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"Is it something like this that you're after? This was just a quickie so it could use some work but I think you'll get the idea. Seems to be some dispute in this thread as to the correct way to go about this, so I shall call this 'just one way of skinning a cat'.

Cheers Karl"

Karl, no dispute in any way. It least is of coarse not my intention.

And, for sure, several ways to skin a cat very much applies here. :)

I felt pointing out that what kind of alpha does what should be seen as

a hint to learn about premulti- and straight alphas whereabouts.

They are different for a reason.

Please let me show a simple comparison in the attached pictures.

(I hope they show, I've never put anything up here afair..)

My straight alpha attempts are pretty coarse but should at least tell

how a premulti alpha can cutout parts the wrong way.

Straight alphas can keep the pixel info better.

Please compare the upper part of the feather.

(The lower part could still have some minutes of added work).

Cheers

Lennart

post-1457-1237303464_thumb.jpg

post-1457-1237303491_thumb.jpg

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It's OK, dispute (as long as it's polite) is a useful learning resource. Your examples clearly illustrate the differences. Are these examples straight from C4D checking and unchecking the premultiply option in the material alpha channel? I'm assuming this isn't a multi-pass, comp'd in post kind of premultiply exercise.

Cheers

Karl

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The renders are right out of Cinema.

Since my chops is far better in AE than in PS, I put the Feather

in AE and extracted a initial alpha by unmult (by Knoll). Used

Curve to enhance it somewhat.

This is the alpha, used as a separate file in Cinema.

Then ,still in AE, took the feather picture, duplicate it and

expanded/blurred/copied the duplicate -under- the original pict.

Cut the original pict by the made alpha.

Now the feather picture "bleeds" outside its boundaries

with the (hopefully correct colors).

This is the picture used in the color channel of Cinema.

An alternive "quick fix" is to do as you did, but have the

alpha picture ie four times in a Layer Shader.

Having the layers set to (down to up)

Normal,Screen,Overlay, Lighten.(Or what look best)

This gives a -similar- result, not as detailed and possible not

suited for animation (will most likely flicker).

Cheers

Lennart

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"Is it something like this that you're after? This was just a quickie so it could use some work but I think you'll get the idea. Seems to be some dispute in this thread as to the correct way to go about this, so I shall call this 'just one way of skinning a cat'.

Cheers Karl"

Karl, no dispute in any way. It least is of coarse not my intention.

And, for sure, several ways to skin a cat very much applies here. :)

I felt pointing out that what kind of alpha does what should be seen as

a hint to learn about premulti- and straight alphas whereabouts.

They are different for a reason.

Please let me show a simple comparison in the attached pictures.

(I hope they show, I've never put anything up here afair..)

My straight alpha attempts are pretty coarse but should at least tell

how a premulti alpha can cutout parts the wrong way.

Straight alphas can keep the pixel info better.

Please compare the upper part of the feather.

(The lower part could still have some minutes of added work).

Cheers

Lennart

WOW what is straight alpha? How can make it in Cinema4d? Where do u use After Effects?

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