Revealing an image Pixel By Pixel ?

Mar 16, 2008 at 10:51pm

Revealing an image Pixel By Pixel ?

Hi,

I am thinking about the best way to approach a project where I reveal an image pixel by pixel over a long time period.

So i will have an image 720 X 576 pixels, and I want to “un-mask” each pixel individually.

What’s the best way to do this in Jitter? I looked at Jit.Scissors but it seems a bit cumbersome for something like this…

Any advice?

Thanks!

#36380
Mar 16, 2008 at 11:01pm

setcell, getcell over at jit.matrix

On Mon, Mar 17, 2008 at 12:51 AM, John Callaghan wrote:

>
> Hi,
>
> I am thinking about the best way to approach a project where I reveal an
> image pixel by pixel over a long time period.
>
> So i will have an image 720 X 576 pixels, and I want to “un-mask” each
> pixel individually.
>
> What’s the best way to do this in Jitter? I looked at Jit.Scissors but it
> seems a bit cumbersome for something like this…
>
> Any advice?
>
> Thanks!
>

#124802
Mar 18, 2008 at 12:08am

Thanks….

But I think I was approaching this the wrong way around..

What I need to do is superimpose a black mask over the image I want to reveal. Then I want to unmask each individual pixel one by one to gradually show what is beneath.

What’s the best way to approach this?

Setcell, getcell only refer to colour values and not transparency, right?

Quote: yair r. wrote on Sun, 16 March 2008 17:01
—————————————————-
> setcell, getcell over at jit.matrix
>
>

#124803
Mar 18, 2008 at 9:17am

no, it depends on your matrix. if you manipulate a 4 plane matrix the first
plane is alpha.
it is covered real nicely in the first chapter of the tutorials. the
jit.matrix help file deals with a special case of matrices, 3d ones.

On Tue, Mar 18, 2008 at 2:08 AM, John Callaghan wrote:

>
> Thanks….
>
> But I think I was approaching this the wrong way around..
>
> What I need to do is superimpose a black mask over the image I want to
> reveal. Then I want to unmask each individual pixel one by one to gradually
> show what is beneath.
>
> What’s the best way to approach this?
>
> Setcell, getcell only refer to colour values and not transparency, right?
>
> Quote: yair r. wrote on Sun, 16 March 2008 17:01
> —————————————————-
> > setcell, getcell over at jit.matrix
> >
> >
>

#124804
Mar 18, 2008 at 9:54am

hi john. how’s canada?

you can make one image that is black and white with getcell setcell,
then just jit.op @op * that with the image/video you want to reveal
(where it’s white, you will see it, where it’s black you won’t – and
yes, grayscales in between work too).

nathaniel

http://nathanielstern.com

On Mar 18, 2008, at 9:17 AM, yair reshef wrote:

> no, it depends on your matrix. if you manipulate a 4 plane matrix
> the first plane is alpha.
> it is covered real nicely in the first chapter of the tutorials.
> the jit.matrix help file deals with a special case of matrices, 3d
> ones.
>
> On Tue, Mar 18, 2008 at 2:08 AM, John Callaghan
> wrote:
>
> Thanks….
>
> But I think I was approaching this the wrong way around..
>
> What I need to do is superimpose a black mask over the image I want
> to reveal. Then I want to unmask each individual pixel one by one
> to gradually show what is beneath.
>
> What’s the best way to approach this?
>
> Setcell, getcell only refer to colour values and not transparency,
> right?
>
> Quote: yair r. wrote on Sun, 16 March 2008 17:01
> —————————————————-
> > setcell, getcell over at jit.matrix
> >
> >
>

#124805
Mar 18, 2008 at 3:01pm

Hey Nathaniel, it’s very white!

Thanks for the help guys…..

Quote: nathaniel.stern wrote on Tue, 18 March 2008 03:54
—————————————————-
> hi john. how’s canada?
>
> you can make one image that is black and white with getcell setcell,
> then just jit.op @op * that with the image/video you want to reveal
> (where it’s white, you will see it, where it’s black you won’t – and
> yes, grayscales in between work too).
>
> nathaniel
> http://nathanielstern.com

#124806

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