Class JpegReaderOptions

Namespace

Egami.Formats.Jpeg

Assembly

Egami.dll

Options for reading JPEG, on top of the general ReaderOptions.

public sealed record JpegReaderOptions : ReaderOptions, IEquatable<ReaderOptions>, IEquatable<JpegReaderOptions>

Inheritance

object

ReaderOptions

JpegReaderOptions

Implements

IEquatable<ReaderOptions>

IEquatable<JpegReaderOptions>

Inherited Members

ReaderOptions.Recovery

ReaderOptions.ReadMetadata

ReaderOptions.ConvertColorTo

ReaderOptions.Hdr

ReaderOptions.Frames

ReaderOptions.MinimumSize

ReaderOptions.Region

object.Equals(object)

object.Equals(object, object)

object.GetHashCode()

object.GetType()

object.ReferenceEquals(object, object)

object.ToString()

Examples

using Raster photo = Raster.Load("duck.jpg", options: new JpegReaderOptions { FastUpsampling = true });
JpegDetails details = (JpegDetails)photo.Metadata.FormatDetails!;
Console.WriteLine($"{details.ColorSpace}, progressive: {details.Progressive}, quality about {details.EstimatedQuality}");
foreach (JpegComponent component in details.Components)
{
    Console.WriteLine($"Component {component.Id}: sampled {component.HorizontalSampling} × {component.VerticalSampling}");
}

// Gray output, and 4:4:4 (no chroma subsampling) for sharp colored edges.
photo.Save("gray.jpg", new JpegWriterOptions { ColorType = JpegColorType.Gray });
photo.Save("sharp.jpg", new JpegWriterOptions { Quality = 90, Subsampling = ChromaSubsampling.Subsample444 });

Properties

Default

Gets the default options.

public static JpegReaderOptions Default { get; }

Property Value

JpegReaderOptions

FastUpsampling

Gets a value indicating whether subsampled chroma is replicated instead of smoothly interpolated. Off by default, which matches libjpeg-turbo, Skia and browsers; on is a little faster and gives blockier color edges, the way some other decoders look.

public bool FastUpsampling { get; init; }

Property Value

bool