This function retrieves the current resolution settings of the HIGEAR image.
Declaration:
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AT_ERRCOUNT ACCUAPI IG_image_resolution_get(
HIGEAR hIGear,
LPLONG lpXResNumerator,
LPLONG lpXResDenominator,
LPLONG lpYResNumerator,
LPLONG lpYResDenominator,
LPAT_MODE lpnUnits
);
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Arguments:
| Name | Type | Description |
| hIGear | HIGEAR | HIGEAR handle to the image. |
| lpXResNumerator | LPLONG | Pointer to a LONG variable that receives the x resolution numerator. |
| lpXResDenominator | LPLONG | Pointer to a LONG variable that receives the x resolution denominator. |
| lpYResNumerator | LPLONG | Pointer to a LONG variable that receives the y resolution numerator. |
| lpYResDenominator | LPLONG | Pointer to a LONG variable that receives the y resolution denominator. |
| lpnUnits | LPAT_MODE | Pointer to an AT_MODE variable that receives the resolution units. See enumIGResolutionUnits for possible values. |
Return Value:
Returns the number of ImageGear errors that occurred during this function call.
Supported Raster Image Formats:
All pixel formats supported by ImageGear Professional.
Sample:
Color, MFC Multipage, Print
Example:
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HIGEAR hIGear; AT_RESOLUTION res; AT_ERRCOUNT nErrCount; // Load the image nErrCount = IG_load_file("picture.tif", &hIGear); if (nErrCount == 0) { // Obtain the image's resolution nErrCount = IG_image_resolution_get(hIGear, &res.xResNumerator, &res.xResDenominator, &res.yResNumerator, &res.yResDenominator, &res.nUnits); // Change the current resolution setting to INCHES if (nErrCount == 0) nErrCount = IG_util_resolution_units_convert(&res, IG_RESOLUTION_INCHES); // Set the modified resolution if (nErrCount == 0) nErrCount = IG_image_resolution_set(hIGear, res.xResNumerator, res.xResDenominator, res.yResNumerator, res.yResDenominator, res.nUnits); // ... // Delete the image IG_image_delete(hIGear); } |
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Remarks:
This function returns the resolution values and units of the HIGEAR image.
ImageGear stores resolution as a pair or rational numbers and a unit specification. This is the method used by several image file formats, which allows storing precise resolution values, rather than their double or float approximations. To set the X resolution of the image to 300 DPI, the numerator can be 300 and the denominator 1 (900 and 3 would also work).
Use IG_image_resolution_set to set image resolution.
Use IG_util_resolution_units_convert to convert resolution to different units.
An alternative way to obtain the image resolution is to get its DIB information using IG_image_DIB_info_get, and then get the resolution using IG_DIB_resolution_get.