fmt

Response Image Format.

fmt=format[, [pixelType],[compression]]

format – avif-alpha | avif | eps | f4m | gif-alpha | gif | jpeg | jpeg2000-alpha | jpeg2000 | jpegxr-alpha | jpegxr | jpg | m3u8 | pdf | pjpeg | png-alpha | png | png8-alpha | png8 | swf-alpha | swf | swf3-alpha | swf3 | tif-alpha | tif | web-alpha | webp

format Description
avif-alpha Lossy and lossless AVIF with alpha channel.
avif Lossy and lossless AVIF.
eps Uncompressed binary Encapsulated PostScript.
f4m Flash Streaming Server manifest format.
gif-alpha GIF with 2 to 255 colors plus key-color transparency.
gif GIF with 2 to 256 colors.
jpeg Lossy JPEG.
jpeg2000-alpha Lossy and lossless JPEG 2000 with alpha channel.
jpeg2000 Lossy and lossless JPEG 2000.
jpegxr-alpha Lossy and lossless JPEG XR with alpha channel.
jpegxr Lossy and lossless JPEG XR.
jpg Lossy JPG.
m3u8 Apple Streaming Server manifest format.
pdf Image embedded in PDF.
pjpeg Progressive JPEG.
png-alpha 24-bit lossless PNG with alpha channel.
png 24-bit lossless PNG.
png8-alpha 8-bit lossless PNG with alpha channel.
png8 8-bit lossless PNG.
swf-alpha Lossy JPEG and a deflate-compressed mask embedded into an Adobe AS2 swf file.
swf Lossy JPEG embedded into an Adobe AS2 swf file.
swf3-alpha Lossy JPEG and a deflate-compressed mask embedded into an Adobe AS3 swf file. Note: swf and swf-alpha formats are best used for ActionScript 2 applications (Flash Player 8 and earlier). The formats swf3 and swf3-alpha are recommended for use for ActionScript3 applications (Flash Player 9 and later).
swf3 Lossy JPEG embedded into an Adobe AS3 swf file.
tif-alpha TIFF with alpha channel.
tif TIFF.
webp-alpha Lossy and lossless WebP with alpha channel.
webp Lossy and lossless WebP.

pixelType – rgb | gray | cmyk

pixelType Description
cmyk Return CMYK image data.
gray Return gray-scale image data.
rgb Return RGB image data.

compression – none | lzw | zip | jpeg | lossy | lossless

compression Description
jpeg JPEG compression (lossy).
lossy WebP, JPEG 2000, and JPEG XR compression (lossy).
lossless WebP, JPEG 2000, and JPEG XR compression (lossless).
lzw LZW (Lempel-Ziv-Welch) compression (lossless).
none Uncompressed.
zip “Deflate” compression (lossless).

  • format specifies the image encoding format for image data sent to the client and the corresponding response MIME type for the HTTP response header.

  • pixelType can be used to effect output color space conversion when icc= is not specified.

    The default color profile corresponding to pixelType is applied. If color management is disabled, naïve conversion is applied. pixelType is ignored when icc= is specified, which determines the output pixel type.

  • compression is permitted only if tif, tif-alpha, pdf, webp, webp-alpha, jpeg2000, jpeg2000-alpha, jpegxr, or jpegxr-alpha is specified as the format. Refer to the table below for the compression options supported for these image formats.

You can use qlt= to set the JPEG encoding options for these formats: JPEG, TIFF with JPEG compression, PDF with JPEG compression, and SWF. WebP, JPEG 2000, and JPEG XR also use qlt= but the values result in different qualities for the different formats. Use quantize= if fmt=gif or fmt=gif-alpha. Refer to the command descriptions for details. The other formats do not have settable options.

8 bits per pixel component are returned for all formats and pixelTypes (8 bits per pixel for GIF).

The following table lists the valid combinations of *format*and pixelType, the corresponding HTTP response MIME types, whether ICC profiles can be embedded (see iccEmbed=), and what format-specific options you can apply.

format pixelType Response MIME type Embed ICC profile Options

jpeg, jpg, pjpeg

rgb, gray, cmyk

<image/jpeg>

Yes

pathEmbed= , pscan= , qlt= , xmpEmbed=

The pscan= parameter applies only to pjpeg format.

png, png-alpha

rgb, gray

<image/png>

Yes

png8, png8-alpha

rgb

<image/png>

Yes

tif, tif-alpha

rgb, gray, cmyk

<image/tiff>

Yes

compression

( none|lzw|zip|jpeg )

'tiff' only; 'tiff-alpha' does not support jpeg compression.

qlt=

qlt= is ignored unless compression is set to jpeg .

, pathEmbed=, xmpEmbed=

swf,swf3, swf-alpha, swf-alpha3

rgb, gray

<application/x-shockwave-flash>

No

Note: The Adobe Flash Player ignores embedded ICC profiles.

qlt= , attribute::TrustedDomains

pdf

rgb, gray, cmyk

<application/pdf>

Yes

compression

( none|zip|jpeg ), qlt=

qlt= is ignored unless compression is set to jpeg .

eps

rgb, gray, cmyk

<image/eps>

Yes

pathEmbed=

gif, gif-alpha

rgb, gray

Data is converted to palette after conversion to gray or rgb.

<image/gif>

No

quantize=

webp, webp-alpha

rgb

<image/webp>

No

compression ( lossy , lossless )

qlt= is ignored for lossless .

Because there is no concept of chrominance downsampling with the WebP format, if you use a second value with qlt (for example, qlt=80,1 ) the second value ( 1 ) is ignored.

jpeg2000, jpeg2000-alpha

rgb, gray

<image/jp2>

No

Same as above.

jpegxr, jpegxr-alpha

rgb

<image/vnd.ms-photo>

No

Same as above.

avif, avif-alpha

rgb

<image/avif>

No

Same as above.

Properties

Request attribute. Applies regardless of current layer setting if req=img (default) or req=mask; ignored otherwise.

type is ignored if iccProfile= is specified.

Default

fmt=jpeg, *defaultType*,none, where the defaultType is handled as follows: If icc= is specified, defaultType corresponds to the pixel type of the specified ICC profile. If icc= is not specified, defaultType is gray if req=mask, otherwise it is rgb.

Examples

Request a small, low-quality preview image in JPEG format (default):

http:// *server*/myRootId/myImageId?qlt=60&wid=200

Request the same image converted to gray-scale:

http:// *server*/myRootId/myImageId?fmt=jpeg,gray&qlt=60&wid=200

Request the same image in a loss-less format with alpha channel and at high resolution:

http:// *server*/myRootId/myImageId?fmt=png-alpha&wid=300

Request the alpha channel for the same image as a gray-scale TIFF image:

http:// *server*/myRootId/myImageId?req=mask&fmt=tif,gray&wid=300

Convert the same image to cmyk using the default ICC profiles:

http:// *server*/myRootId/myImageId?fmt=tif,cmyk&wid=300

Convert the same image to cmyk using a different ICC profile and embed the profile in the TIFF image:

http:// *server*/myRootId/myImageId?fmt=tif&wid=300&icc=myPrinterProfile&iccEmbed=1

Deliver this image as a TIF file with JPEG compression without pixel type conversion:

http:// *server*/myRootId/myImageId?fmt=tif,,jpeg&qlt=95&wid=300

Convert image to a bi-tonal GIF with key-color transparency and force colors to black and white:

http:// *server*/myRootId/myImageId?fmt=gif-alpha&wid=100&quantize=adaptive,off,2,000000,ffffff

Lossy with a quality setting of 80:

http:// *server*/myRootId/myImageId?wid=300&fmt=webp&qlt=80

Lossless with alpha:

http:// *server*/myRootId/myImageId?wid=300&fmt=webp-alpha,,lossless

Lossy with a quality setting of 80:

http://server/myRootId/myImageId?wid=300&fmt=jpeg2000&qlt=80

Lossless with alpha:

http://server/myRootId/myImageId?wid=300&fmt=jpeg2000-alpha,,lossless

Lossy with a quality setting of 80:

http://server/myRootId/myImageId?wid=300&fmt=jpegxr&qlt=80

Lossless with alpha:

http://server/myRootId/myImageId?wid=300&fmt=jpegxr-alpha,,lossless

See also

qlt= , quantize=, req=, icc=, iccEmbed=, pathEmbed=, pscan.

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