Convert to Image with advanced options Leave feedback

GroupDocs.Conversion provides ImageConvertOptions to give you control over conversion result when convert to image. Along with common convert options from the base class, ImageConvertOptions has the following additional options:

• Format specifies desired result document type. Available options are: Tiff, Tif, Jpg, Jpeg, Png, Gig, Bmp, Ico, Psd, Wmf, Emf, Dcm, Webp, Dng, Svg, Jp2, Odg, J2c, J2k, Jpx, Jpf, Jpm, Eps, Cgm, Cdr, Cmx, Dib, Jpc, Jls, DjVu.
• Width specifies desired image width after conversion.
• Height specifies desired image height after conversion.
• HorizontalResolution specifies desired image horizontal resolution after conversion.
• VerticalResolution specifies desired image vertical resolution after conversion.
• Grayscale specifies if true converted image will be grayscaled.
• RotateAngle specifies image rotation angle.
• FlipMode specifies image flip mode. Available options are: None, FlipX, FlipY, FlipXY.
• Brightness adjusts image brightness.
• Contrast adjusts image contrast.
• Gamma adjusts image gamma.
• BackgroundColor sets the background color where supported by the source format.
• CropArea crops a rectangular area from the raster image after conversion. Specify as Rectangle(left, top, right, bottom), in pixels.
• JpegOptions contains JPEG specific convert options.
• TiffOptions contains TIFF specific convert options.
• PsdOptions contains PSD specific convert options.
• WebpOptions contains WebP specific convert options.
• UsePdf. Sometimes, for better rendering and elements positioning the source document should be converted to PDF first. If this property is set to true, the input firstly is converted to PDF and after that to desired format.

The following code snippet shows how to convert to image with advanced options:

string outputFileTemplate = Path.Combine(@"c:\output", "converted-page-{0}.png");
Func<SavePageContext, Stream> getPageStream = saveContext => new FileStream(string.Format(outputFileTemplate, saveContext.Page), FileMode.Create);
using (Converter converter = new Converter("sample.pdf"))
{
    ImageConvertOptions options = new ImageConvertOptions
    {
        Format = ImageFileType.Png,
        FlipMode = ImageFlipModes.FlipY,
        Brightness = 50,
        Contrast = 50,
        Gamma = 0.5F,
        Grayscale = true,
        HorizontalResolution = 300,
        VerticalResolution = 100
    };

    converter.Convert(getPageStream, options);
}

Image formats other than TIFF hold one page per file, so the examples below save each page of the multi-page source to its own image through a SavePageContext callback.

Set a background color for the converted image where supported by the source format:

using System.Drawing;
using (Converter converter = new Converter("sample.pdf"))
{
    ImageConvertOptions options = new ImageConvertOptions
    {
        Format = ImageFileType.Png,
        BackgroundColor = Color.White  // Use System.Drawing.Color
    };
    converter.Convert((SavePageContext context) => File.Create($"white-background-{context.Page}.png"), options);
}

You can use any color from System.Drawing.Color or create custom colors:

using System.Drawing;
using (Converter converter = new Converter("sample.pdf"))
{
    ImageConvertOptions options = new ImageConvertOptions
    {
        Format = ImageFileType.Png,
        BackgroundColor = Color.FromArgb(173, 216, 230)  // Light blue (RGB)
    };
    converter.Convert((SavePageContext context) => File.Create($"custom-background-{context.Page}.png"), options);
}

Crop a specific rectangular area from the converted image. The CropArea property takes a Rectangle defined by its edges, in pixels: the left and top edges of the area, followed by its right and bottom edges. The example below keeps a 300 × 200 pixel area whose top-left corner is at (100, 100):

using GroupDocs.Conversion.Contracts;
using (Converter converter = new Converter("sample.pdf"))
{
    ImageConvertOptions options = new ImageConvertOptions
    {
        Format = ImageFileType.Png,
        CropArea = new Rectangle(100, 100, 400, 300)  // Left, Top, Right, Bottom
    };
    converter.Convert((SavePageContext context) => File.Create($"cropped-image-{context.Page}.png"), options);
}

You can combine BackgroundColor and CropArea:

using GroupDocs.Conversion.Contracts;
using (Converter converter = new Converter("sample.pdf"))
{
    ImageConvertOptions options = new ImageConvertOptions
    {
        Format = ImageFileType.Png,
        BackgroundColor = System.Drawing.Color.LightGray,
        CropArea = new Rectangle(50, 50, 562, 562)  // A 512 x 512 pixel area
    };
    converter.Convert((SavePageContext context) => File.Create($"background-and-crop-{context.Page}.png"), options);
}

JpegOptions is subset of ImageConvertOptions which allow enhanced control over conversions to JPEG format.

The following options are available:

• Quality specifies desired image quality.
• ColorMode sets JPEG color mode. Available options are: Rgb, YCbCr, Cmyk, Ycck, Grayscale.
• Compression sets JPEG compression methods. Available options are: Baseline, Progressive, Lossless, JpegLs.

TiffOptions is subset of ImageConvertOptions which allow enhanced control over conversions to TIFF format.

The following options are available:

• Compression sets TIFF compression method. Available options are: None, Lzw, Ccitt3, Ccitt4, Rle.

PsdOptions is subset of ImageConvertOptions which allow enhanced control over conversions to PSD format.

The following options are available:

• ChannelBitsCount sets bits count per channel.
• ChannelsCount sets color channels count.
• ColorMode sets PSD color mode. Available options are: Bitmap, Grayscale, Indexed, Rgb, Cmyk, Multichannel, Duotone, Lab.
• Compression sets PSD compression method. Available options are: Raw, Rle, ZipWithoutPrediction, ZipWithPrediction.
• Version sets desired PSD version.

WebpOptions is subset of ImageConvertOptions which allow enhanced control over conversions to WebP format.

The following options are available:

• Lossless sets the compression of the converted image will be lossless.
• Quality sets set the quality of converted image.

• API Reference: ImageConvertOptions
• Supported File Formats
• Common Conversion Options