Hi Carsten, 

hier das script um bikubische Interpolation manuell zu erzwingen (für 
ältere gd-lib-versionen) 

[snipped but not skipped] 

> 
> schick, schick... *lol* 
> aber ich meinte eigentlich den link fuer das bicubic-resize-php-script... 
> 

--- BEGIN PHP-SCRIPT --- 

jernberg@fairytale.se 
15-Feb-2001 06:02 

[Ed. note: if you're using GD 2.x, you can use imagecopyresampled() 
which does exactly the same thing] 

Here is my addition to imagecopyresized 

it implements bicubic interpolation of pixels so the result is much 
better than the ordinary imagecopyresized ... 

copy it into the src/ext/gd/gc.c and recompile the lib. 
i wish someone could do that so it's included in the "official" release 

it's a really good function to scale down pictures to thumbnails. 

/* {{{ proto int imagecopyresizedbicubic(int dst_im, int src_im, int 
dst_x, int dst_y, int src_x, int src_y, int dst_w, int dst_h, int src_w, 
int src_h) 
  Copy and resize part of an image */ 
PHP_FUNCTION(imagecopyresizedbicubic) 
{ 
zval **SIM, **DIM, **SX, **SY, **SW, **SH, **DX, **DY, **DW, **DH; 
gdImagePtr im_dst, im_src; 
int srcH, srcW, dstH, dstW, srcY, srcX, dstY, dstX; 
int i, j; 
int r, g, b, c1,c2,c3,c4,color; 
float sX, sY; 
float scaleX,scaleY,scaleX2,scaleY2; 
GDLS_FETCH(); 

if (ZEND_NUM_ARGS() != 10 || 
zend_get_parameters_ex(10, &DIM, &SIM, &DX, &DY, &SX, &SY, &DW, &DH, 
&SW, &SH) == FAILURE) 
{ 
WRONG_PARAM_COUNT; 
} 

ZEND_FETCH_RESOURCE(im_dst, gdImagePtr, DIM, -1, "Image", le_gd); 
ZEND_FETCH_RESOURCE(im_src, gdImagePtr, SIM, -1, "Image", le_gd); 

convert_to_long_ex(SX); 
convert_to_long_ex(SY); 
convert_to_long_ex(SW); 
convert_to_long_ex(SH); 
convert_to_long_ex(DX); 
convert_to_long_ex(DY); 
convert_to_long_ex(DW); 
convert_to_long_ex(DH); 

srcX = Z_LVAL_PP(SX); 
srcY = Z_LVAL_PP(SY); 
srcH = Z_LVAL_PP(SH); 
srcW = Z_LVAL_PP(SW); 
dstX = Z_LVAL_PP(DX); 
dstY = Z_LVAL_PP(DY); 
dstH = Z_LVAL_PP(DH); 
dstW = Z_LVAL_PP(DW); 

// kopiera paletten 

for( i=0; i<256; i++ ) { 
gdImageColorAllocate( im_dst, im_src->red[i], im_src->green[i], 
im_src->blue[i] ); 
}; 

// gdImageCopyResized(im_dst, im_src, dstX, dstY, srcX, srcY, dstW, 
dstH, srcW, srcH); 

scaleX = (float)(srcW-1) / (float)dstW; 
scaleY = (float)(srcH-1) / (float)dstH; 

scaleX2 = scaleX/2.0f; 
scaleY2 = scaleY/2.0f; 

for( j=0; j<dstH; j++ ) { 
for( i=0; i<dstW; i++ ) { 

sX = (float)i * scaleX; 
sY = (float)j * scaleY; 

c1 = gdImageGetPixel(im_src, (int)(sX), (int)(sY+scaleY2) ); 
c2 = gdImageGetPixel(im_src, (int)(sX), (int)(sY) ); 
c3 = gdImageGetPixel(im_src, (int)(sX+scaleX2), (int)(sY+scaleY2) ); 
c4 = gdImageGetPixel(im_src, (int)(sX+scaleX2), (int)(sY) ); 

r = (im_src->red[c1] + im_src->red[c2] + im_src->red[c3] + 
im_src->red[c4]) / 4; 
g = (im_src->green[c1] + im_src->green[c2] + im_src->green[c3] + 
im_src->green[c4]) / 4; 
b = (im_src->blue[c1] + im_src->blue[c2] + im_src->blue[c3] + 
im_src->blue[c4]) / 4; 

color=gdImageColorClosest(im_dst,r,g,b); 
gdImageSetPixel( im_dst, (i+dstX),(j+dstY), color ); 

}; 
}; 

RETURN_TRUE; 
} 


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Ich hoffe Du kannst etwas damit anfangen. 

regards, 

Till