imformats returns the list of supported image formats.

formats = imformats() returns the list of supported image formats in a structure array.

format = imformats(ext) returns the structure of the image format corresponding to the extension ext.

Each element of the structure array contains the fields:

• ext: file format extension
• isa: reserved field; empty because signature detection is centralized
• info: reserved field; empty because capabilities are stored in this structure
• description: file format description
• read: imread capability, or empty for an unreadable format
• write: imwrite capability, or empty for a read-only format
• alpha: logical scalar indicating if the file format supports transparency
• multipage: logical scalar indicating exposed multi-image writing; only GIF is true

The registry is deterministic and does not depend on desktop image plugins. An empty read or write field means that the operation is not supported. In the array returned without an argument, these fields contain the function name; a single-format query returns the equivalent function handle.

Canonical extension	Aliases	Read	Write	Alpha	Multipage
png	-	yes	yes	yes	no
jpg	jpeg, jfif	yes	yes	no	no
gif	-	yes	yes	yes	yes
webp	-	yes	yes	yes	no
tiff	tif	yes	yes	yes	no
bmp	dib	yes	yes	yes	no
tga	-	yes	yes	yes	no
pbm	-	yes	yes	no	no
pgm	-	yes	yes	no	no
ppm	-	yes	yes	no	no
pnm	-	yes	yes	no	no
pcx	-	yes	yes	no	no
psd	-	yes	no	yes	no
hdr	rgbe	yes	no	no	no
pic	-	yes	no	yes	no

imwriteimread