The PDFCOMPOPTIONS structure provides information about PDF Compressor options.


typedef struct _PDFCOMPOPTIONS 
   L_UINT uStructSize; 
   L_UINT32 dwFlags; 
   L_UINT uCleanSize; 
   L_UINT uBackGroundThreshold; 
   L_UINT uCombineThreshold; 
   L_UINT uSegmentQuality; 
   L_UINT uColorThreshold; 


L_UINT uStructSize

Size of this structure in bytes, for versioning. Use the sizeof() operator to calculate this value.

L_UINT32 dwFlags

Flag that indicates the PDF Compressor options behavior. Possible values are:

Value Meaning
PDFCOMP_FAVOR_ONEBIT [0x00] Favor the detection of 1-bit segments.
PDFCOMP_FAVOR_TWOBIT [0x01] Favor the detection of 2-bit segments.
PDFCOMP_FORCE_ONEBIT [0x02] Force all 2-bit segments to be 1-bit.
PDFCOMP_FORCE_TWOBIT [0x03] Force all 1-bit segments to be 2-bit.
PDFCOMP_WITH_BACKGROUND [0x00] Detect background segments.
PDFCOMP_WITHOUT_BACKGROUND [0x10] Do not detect background segments.



Value that indicates the bitmap's quality before processing. Possible values are:

Value Meaning
PDFCOMP_IMAGEQUALITY_UNKNOWN [0] Unknown image quality. Use default handling.
PDFCOMP_IMAGEQUALITY_NOISY [1] The source image is noisy.
PDFCOMP_IMAGEQUALITY_SCANNED [2] The source image is a scanned image.
PDFCOMP_IMAGEQUALITY_PRINTED [3] The source image is a printed document.
PDFCOMP_IMAGEQUALITY_COMPUTER_GENERATED [4] The source image is a high quality computer-generated image.
PDFCOMP_IMAGEQUALITY_PHOTO [5] The source image is a high quality photo image; for example, from a digital camera .
PDFCOMP_IMAGEQUALITY_USER [6] The quality is set manually. This flag is for advanced users.



Value that indicates the image's output quality. Possible values are:

Value Meaning
PDFCOMP_OUTPUTQUALITY_AUTO [0] Choose the quality of the output automatically.
PDFCOMP_OUTPUTQUALITY_POOR [1] Poor output quality with best compression.
PDFCOMP_OUTPUTQUALITY_AVERAGE [2] Average output quality with average compression.
PDFCOMP_OUTPUTQUALITY_GOOD [3] Good output quality with good compression.
PDFCOMP_OUTPUTQUALITY_EXCELLENT [4] Excellent output quality with poor compression.
PDFCOMP_OUTPUTQUALITY_USER [5] The user detects the output quality. This flag is for advanced users.

L_UINT uCleanSize

Value that indicates the size of the area used to remove the noise inside the segmented image. Possible values range from 0 to 10, where 0 means skip the cleaning stage.

L_UINT uBackGroundThreshold

Threshold value used to separate image objects from the background. Best values are from 5 to 35.

L_UINT uCombineThreshold

Threshold value used to combine colors. Colors that are closer together than this amount will be combined. The best value is 25. Values saturate at 443.

L_UINT uSegmentQuality

Threshold value used to determine whether the segment is a picture segment. Possible values range from 0 to 100. Use 0 to set all possible picture segments to 2-bit without losing a lot of information. Use 100 to set all picture segments to 2-bit only if they are very close to 2-bit.

L_UINT uColorThreshold

Threshold value used to merge segments. Best values are from 75 to 125.


LPPDFCOMPOPTIONS is a pointer to a PDFCOMPOPTIONS structure. Where a function parameter type is LPPDFCOMPOPTIONS, declare a PDFCOMPOPTIONS variable and pass the variable's address in the parameter. Declaring an LPPDFCOMPOPTIONS variable is necessary only if the program requires a pointer.

The values of uCleanSize, uBackGroundThreshold and uCombineThreshold are valid only if the imageQuality is set to PDFCOMP_IMAGEQUALITY_USER flag.

The values of uSegmentQuality and uColorThreshold are valid only if the outputQuality is set to PDFCOMP_OUTPUTQUALITY_USER flag.


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