Scratch

siderits · 2009-11-21 07:57:46

Greetings all.
Is there a way to query the color of a pixel in a canvas image?
I'm working on some basic image analysis functions and need to quantify pixel colors in images.

Is this possible?

Thanks

Sid

cds56 · 2009-11-21 09:55:30

You mean the
(touching color ____?) block?

siderits · 2009-11-21 10:58:50

I'd like to find out what color is at a given pixel on a background image, so I can reassign it. For example, if I have an image of cells as my canvas, then what color pixel is at x=200 and y=150.

Is that possible?
Thanks
Sid

cds56 · 2009-11-21 15:24:46

no, I don't think that's easily possible without a lot of scratch coding.

jacool · 2009-11-22 07:59:57

siderits wrote:
I'd like to find out what color is at a given pixel on a background image, so I can reassign it. For example, if I have an image of cells as my canvas, then what color pixel is at x=200 and y=150.

Is that possible?
Thanks
Sid

You could have a one pixel sprite and use the <Go to _ x and _ y> block to set the coordinates.
And for the color sensing, the only way right now is to use the <if touching color _> block hmm

This is my 1337th post big_smile

siderits · 2009-11-22 08:13:30

Thanks for the feedback.
I think that it would be useful for developing image analysis algorithms.
Best regards;
Sid

Scratch

archived forums

#1 2009-11-21 07:57:46

Query a pixel color on a canvas

#2 2009-11-21 09:55:30

Re: Query a pixel color on a canvas

#3 2009-11-21 10:58:50

Re: Query a pixel color on a canvas

#4 2009-11-21 15:24:46

Re: Query a pixel color on a canvas

#5 2009-11-22 07:59:57

Re: Query a pixel color on a canvas

siderits wrote:

#6 2009-11-22 08:13:30

Re: Query a pixel color on a canvas

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