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Overview ​

ComPDF Conversion SDK provides an API for converting PDF to images.

Setting Image Formats ​

Supported image formats include:

  • JPG
  • JPEG
  • JPEG2000
  • PNG
  • BMP
  • TIFF
  • TGA
  • GIF
  • WEBP

Setting Image Color Modes ​

Supported image color modes include:

  • e_CColor: Color mode, where the image effect is consistent with the original PDF page.
  • e_CGray: Grayscale mode.
  • e_CBinary: Black and white mode.

Setting Image Scaling ​

The SDK supports setting image scaling. If you want to double the image size, set image_scaling to 2.0f; to reduce the image size by half, set image_scaling to 0.5f.

Enhancing Image Path Display ​

The SDK supports image_path_enhance for enhancing the display of image paths. This option can be enabled when you want to improve the display effect of paths within the PDF page.

  • Disable image_path_enhance option: Image path rendering without enhancement
  • Enable image_path_enhance option: Image path rendering with enhancement

Notice ​

  • A higher image_scaling value results in images with higher resolution, but it also increases memory usage and slows down conversion.
  • A higher image_scaling value does not necessarily mean higher clarity. The clarity also depends on the original image resolution in the document.

Sample ​

c
CConvertOption option = CPDF_DefaultConvertOption();

option.image_type = e_CJPEG;
CPDF_StartPDFToImage(CPDF_TEXT("jpeg.pdf"), CPDF_TEXT("password"), CPDF_TEXT("path/output"), option, NULL);

option.image_type = e_CPNG;
option.image_scaling = 2.0f;
CPDF_StartPDFToImage(CPDF_TEXT("png.pdf"), CPDF_TEXT("password"), CPDF_TEXT("path/output"), option, NULL);