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Ruby / Guides / Create a thumbnail
To create a PDF page thumbnail in multiple image formats.
doc = PDFDoc.new(filename) draw = PDFDraw.new # The output resolution is set to 92 DPI. draw.SetDPI(92) # Rasterize the first page in the document and save the result as PNG. pg = doc.GetPage(1) draw.Export(pg, output_filename, "PNG")
Convert PDF to image (JPG, PNG, BMP, TIFF)
Full code sample illustrates how to use the built-in rasterizer in order to render PDF images on the fly and how to save resulting images in PNG and JPEG format.
More image format options:
"RAW" : RAW format.
There are four possibilities:
e_rgba- if transparent and color page;
e_gray_alpha- if transparent and gray page;
e_rgb- if opaque and color page;
e_gray- if opaque and gray page. NOTE that if page is set to be transparent (SetPageTransparent), the output color channels are already multiplied by the alpha channel.
"BMP" : Bitmap image format (BMP)
"JPEG" : Joint Photographic Experts Group (JPEG) image format
"PNG" : 24-bit W3C Portable Network Graphics (PNG) image format
"PNG8" : 8-bit, palettized PNG format. The exported file size should be smaller than the one generated using "PNG", possibly at the expense of some image quality.
"TIFF" : Tag Image File Format (TIFF) image format.
"TIFF8" : Tag Image File Format (TIFF) image format (with 8-bit palete).
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