Did this in the end;
...
int nr = table[r] & 0xFF;
int ng = table[g] & 0xFF;
int nb = table[b] & 0xFF;
...
Where table is a byte array.
Have a good weekend!!
On Fri, May 22, 2009 at 9:09 PM, Gavin Aiken <[email protected]>wrote:
> Hey all,
>
> Before I submit this I just wanted to check it's not a java nuiance.
>
> The Color class can be used to extract rgb values from a pixel (32 bit
> int).
>
> I implemented a lookup table filter and used a byte to store each
> individual r g & b value to save a bit of space.
>
> Long story short;
>
> public void testColor(){
>
> int nr = (byte)0; // Simulation of lookup in array of byte values
> representing individual bands
> int ng = (byte)0;
> int nb = (byte)0;
> int nc = Color.rgb(nr, ng, nb);
>
> assertEquals(nr,Color.red(nc));
> assertEquals(ng,Color.green(nc));
> assertEquals(ng,Color.blue(nc));
>
> nr = (byte)0;
> ng = (byte)137;
> nb = (byte)0;
> nc = Color.rgb(nr, ng, nb);
>
> assertEquals(nr,Color.red(nc)); // FAIL HERE
> assertEquals(ng,Color.green(nc));
> assertEquals(nb,Color.blue(nc));
> }
>
> Failure in testColor:
> junit.framework.AssertionFailedError: expected:<0> but was:<255>
> at uk.ac.ic.doc.gea05.miffed.os.ColorTest.testColor(ColorTest.java:44)
>
>
> Any ideas?
>
> 137 is the magic number causing the error in my case, there may be more.
>
>
> Cheers!
>
> Gav
>
>
>
>
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