This function gets a pixel from the specified location in the image.
Declaration:
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AT_ERRCOUNT ACCUAPI IG_DIB_pix_get(
HIGEAR hIGear,
AT_PIXPOS xpos,
AT_PIXPOS ypos,
HIGPIXEL *lphPixel
);
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Arguments:
| hIGear | HIGEAR handle of image from which to get pixel. |
| xpos | X coordinate (0 to width-1). |
| ypos | Y coordinate (0 to height-1). |
| lphPixel | Returns object containing pixel data. |
Return Value:
Returns the number of ImageGear errors that occurred during this function call. If there are no errors, the return value is IGE_SUCCESS.
Supported Raster Image Formats:
All pixel formats supported by ImageGear Professional.
Sample:
Pixel Access
Example:
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AT_ERRCOUNT nErrcount; /* Number of errors on stack */ HIGEAR hImage; /* Handle of image */ HIGPIXEL hPix; /* Handle of pixel */ AT_DIMENSION w, h; /* Width and height of image */ AT_INT nChannels; /* Number of channels in image */ AT_DIMENSION x, y; /* Used to loop over image */ AT_INT c; /* Used to loop over channels */ AT_INT nDepth; /* Channel depth */ AT_UINT inverted; /* Inverted channel value */ /* Invert colors in upper-left quadrant of image */ nErrcount = IG_load_file("test.jpg", &hImage); nErrcount = IG_image_channel_count_get(hImage, &nChannels); nErrcount = IG_image_dimensions_get(hImage, &w, &h, NULL); for (y = 0; y < h / 2; y++) for (x = 0; x < w / 2; x++) { nErrcount = IG_DIB_pix_get(hImage, x, y, &hPix); for (c = 0; c < nChannels; c++) { IG_image_channel_depth_get(hImage, c, &nDepth); nDepth = (1 << nDepth) - 1; inverted = nDepth - IG_pixel_value_get(hPix, c); IG_pixel_value_set(hPix, c, inverted); } nErrcount = IG_DIB_pix_set(hImage, x, y, hPix); IG_pixel_delete(hPix); } nErrcount = IG_save_file(hImage, "test.bmp", IG_SAVE_BMP_UNCOMP); IG_image_delete(hImage); |
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Remarks:
The pixel data is contained by a pixel object with handle of type HIGPIXEL. This pixel object stores values for each channel in the image.