Jpeg file encoding utility

Sets the level of overlap filtering. With overlap filtering, transform coefficients are applied across block and macroblock boundaries. This can reduce blocking artifacts. Specifies whether to use the Quality , Overlap , and Subsampling properties instead of the generic ImageQuality property. For more information about these formats, see Native Pixel Formats. Skip to main content.

This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. Is this page helpful? Please rate your experience Yes No. Any additional feedback? In this article. The flexbits are discarded. This arbitrarily reduces the quality of the planar alpha channel for the transcoded image.

The exact reduction in file size and quality depends on numerous factors and cannot be exactly specified. The high-pass frequency data band is discarded, including the flexbits.

This effectively reduces the resolution of the planar alpha channel by a factor of 4 in both dimensions. The actual dimensions of the transcoded image remain the same, but the image loses all detail in each 4x4 block of alpha-channel pixels.

Typically, you should set this value only when the ImageDataDiscard property has the same value. Both the high-pass and low-pass frequency data bands are discarded, including the flexbits. This ffectively reduces the resolution of the planar alpha channel by a factor of 16 in both dimensions.

The proper setting for this parameter depends on the image quality or file size you want to obtain. You may decrease this setting for high-resolution images with not many fine details to obtain the less file size. But you should enlarge it for web images which are generally have a low resolution and contain some portions with fine details. Anyway, you will get the best ratios with of image quality setting.

Quality or JpegFrame. Quality property. This value ranges from 1 to and equals to 75 by default. A simple JPEG file is stored as one top-to-bottom scan of the image. Progressive JPEG divides the file into a series of scans.

The first scan shows the image at the equivalent of a very low quality setting, and therefore it takes very little space. Following scans gradually improve the quality.

Each scan is added to the data already provided, so that the total storage requirement is roughly the same as for a simple JPEG image of the same quality as the final scan. Basically, progressive JPEG is just a rearrangement of the same data into a more complicated order.

The advantage of progressive JPEG is that an image is viewed on-the-fly as it is transmitted; one can see an approximation to the whole image very quickly, with gradual improvement of quality as one waits longer. This is much nicer than a slow top-to-bottom display of the image.

This functionality is disabled in Graphics Mill by default. To turn it on just set the JpegEncoderOptions. IsProgressive or JpegFrame. IsProgressive property to true. The following code samples demonstrate how to save JPEG file with non-default encoder settings.

Both examples set the quality setting to 90, make JPEG to be progressive and disable chroma subsampling. The first example uses the Save method of the Bitmap class to save file and the JpegEncoderOptions class to set non-default encoder options.

The second code sample uses the JpegWriter and JpegFrame classes to implement the similar functionality. Graphics Mill 5. Aurigma Graphics Mill 5. Textures, patterns and colours are automatically identified.

The encoder creates an optimally compressed JPEG file based on that information. The final result is compared with the original and fine-tuned. Distracting JPEG artifacts are minimized without big sacrifices in file size. Unnecessary metadata is stripped as well. You will get an optimal image, every time! Let me give you a side by side comparison.