Function Reference
— Function File: info = imfinfo (filename)
— Function File: info = imfinfo (url)

Read image information from a file.

imfinfo returns a structure containing information about the image stored in the file filename. The output structure contains the following fields.

Filename
The full name of the image file.
FileSize
Number of bytes of the image on disk
FileModDate
Date of last modification to the file.
Height
Image height in pixels.
Width
Image Width in pixels.
BitDepth
Number of bits per channel per pixel.
Format
Image format (e.g. "jpeg").
LongFormat
Long form image format description.
XResolution
X resolution of the image.
YResolution
Y resolution of the image.
TotalColors
Number of unique colors in the image.
TileName
Tile name.
AnimationDelay
Time in 1/100ths of a second (0 to 65535) which must expire before displaying the next image in an animated sequence.
AnimationIterations
Number of iterations to loop an animation (e.g. Netscape loop extension) for.
ByteOrder
Endian option for formats that support it. Is either "little-endian", "big-endian", or "undefined".
Gamma
Gamma level of the image. The same color image displayed on two different workstations may look different due to differences in the display monitor.
Matte
true if the image has transparency.
ModulusDepth
Image modulus depth (minimum number of bits required to support red/green/blue components without loss of accuracy).
Quality
JPEG/MIFF/PNG compression level.
QuantizeColors
Preferred number of colors in the image.
ResolutionUnits
Units of image resolution. Is either "pixels per inch", "pixels per centimeter", or "undefined".
ColorType
Image type. Is either "grayscale", "indexed", "truecolor", or "undefined".
View
FlashPix viewing parameters.

See also: imread imwrite