Hi Alex,
getPixel gets an integer value that has the same bit pattern as the
float number - not very useful for float calculations. Use
getPixelValue, putPixelValue or directly the pixels array:
float[] pixels = (float[])ip.getPixels();
for (int i=0; i<pixels.length; i++)
if (pixels[i] < 0) pixels[i] += 180;
Michael
________________________________________________________________
On 26 Jun 2009, at 11:10, Alex Ruhl wrote:
> Hi,
>
> I have 32 Bit-images with negative values. I want to add a value to
> these
> pixels to get them positive.
>
> I tried to modify the MyInverter plugin (below) but didnt succeed.
> What do I have to modify to calculate with floating point values?
> I dont get the right values by using getpixel and putpixel.
> Is this only for int-values?
>
> ----------------------------------------------------------------------
> --
> import ij.ImagePlus;
> import ij.plugin.filter.PlugInFilter;
> import ij.process.ImageProcessor;
>
> /* W. Burger, M. J. Burge: "Digitale Bildverarbeitung"
> * � Springer-Verlag, 2005
> * www.imagingbook.com
> */
>
> public class MyInverter_ implements PlugInFilter {
>
> public int setup(String arg, ImagePlus img) {
> return DOES_32; // this plugin accepts 8-bit grayscale
> images
> }
>
> public void run(ImageProcessor ip) {
> int w = ip.getWidth();
> int h = ip.getHeight();
>
> for (int u = 0; u < w; u++) {
> for (int v = 0; v < h; v++) {
> int p = ip.getPixel(u,v);
> if (p<0) {ip.putPixel(u,v,(p+180));}
> }
> }
> }
> }
>
>
> -----------------------------
>
> Thanks for help,
>
> Alex
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