Filter plug-in: How to mix my RGB image with source document image properly?

Hi All,

My problem seems to be very common, but I can't find any answers in documentation.

I made Filter plug-in. It composes RGB image and mixes it with user source image in the document.

inData to byte array and recode each pixel with HostCSConvertColor function.

My code looks like that:

*input = (byte*)filter_record->inData;

  int

width = filter_record->inRect.right - filter_record->inRect.left;

  int height = filter_record->inRect.bottom - filter_record->inRect.top;

  byte

*transfer_buffer;

  int size = width * height * 4;

  transfer_buffer = new byte[size];

  byte *output = transfer_buffer;

  int

planes = CSPlanesFromMode(fpb->imageMode, 3);

  int16 color[4];

  for(j = 0; j < height; j++)

  {

    for(i = 0; i < width; i++)

    {

      for(k = 0; k < planes; k++)

      {

        color[k] = input[i * align + k];

      }

      HostCSConvertColor(filter_record->colorServices, space, plugIncolorServicesRGBSpace, color);

      *

output = (byte)color[0]; output++;

      *

output = (byte)color[1]; output++;

      *

output = (byte)color[2]; output++;

      *

output = 255; output++;

    }

// for width

    input += line;

  } // for height

After that I mix my RGB image with output buffer and make back transition via

HostCSConvertColor to the document Color Space.

It works very slow and looks ugly.

But I can't find any other way to mix my RGB image with photoshop image which can be not RGB Color Mode.

Your help will be very appreciated.

Sofia