PDF to Image — C

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:
• Enable image_path_enhance option:

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

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);