Posted by
Boizeau marielaure on
Jan 22, 2008; 4:31pm
URL: http://imagej.273.s1.nabble.com/RGB-Split-setColor-Color-BLUE-tp3697482p3697484.html
I had try to develop this double "for loop", but it's still slow.
Is there anybody have an other way out ?
Thank you for your help
Marie
-----Original Message-----
From: Johannes Schindelin [mailto:
[hidden email]]
Sent: Monday, January 21, 2008 1:05 PM
To: Boizeau, Marie-Laure SMA/FR
Cc:
[hidden email]
Subject: Re: RGB Split setColor(Color.BLUE)
Hi,
On Mon, 21 Jan 2008, Marie-Laure Boizeau wrote:
> I have develop a plugin with a step of splitting an RGB image and then
> I have to threshold it.
>
> part of the plugin :
>
> ImagePlus imagetosave =win55.getImagePlus();
> IJ.run("RGB Split");
> IJ.setThreshold(128, 255);
> IJ.run("Convert to Mask");
> String pathsave =dir+"/imagesretraitees/"+listTIF[i];
> IJ.saveAs("Tiff", pathsave);
>
> the IJ.run("RGB Split") take a lot of time.
Why don't you do the split yourself?
Something like
int w = imagetosave.getWidth(), h = imagetosave.getHeight();
byte[] pixels = new byte[w * h];
for (int y = 0; y < h; y++)
for (int x = 0; x < w; x++)
byte[x + y * w] =
(imagetosave.getPixel(x, y)[0] >= 128 ?
255 : 0);
new ImagePlus("mask", new ByteProcessor(w, h, pixels, null));
If that is still too slow, you will have to work on a lower level, such
as getting the int[] array of the ColorProcessor directly, and get at
the red value (or the blue value) with boolean operations.
Hth,
Dscho