Guides/Window Driver/Image

Image format

The following formats are supported by Qt

Format	Description	Qt's support
BMP	Windows Bitmap	Read/write
GIF	Graphic Interchange Format (optional)	Read
JPG	Joint Photographic Experts Group	Read/write
JPEG	Joint Photographic Experts Group	Read/write
PNG	Portable Network Graphics	Read/write
PBM	Portable Bitmap	Read
PGM	Portable Graymap	Read
PPM	Portable Pixmap	Read/write
TIFF	Tagged Image File Format	Read/write
XBM	X11 Bitmap	Read/write
XPM	X11 Pixmap	Read/write

jandroid only supports jpeg and png format.

Verbs for reading and writing image files

The following verbs are defined inside qt.ijs

getimg (monad) - reading file images from memory to argb matrix

y raw image data

rgb=: getimg fread jpath '~temp/plot.png'

readimg (monad) - reading file images to argb matrix

y image file name

rgb=: readimg jpath '~temp/plot.png'

putimg (dyad) - write image data to memory

x rgb matrix
y 'jpeg|png|ico|bmp' [ ; 'quality' ; '[0,100]|_1' ]

data=: rgb getimg 'jpeg'

writeimg (dyad) - write image data to file

x rgb matrix
y filename [ ; 'jpeg|png|ico|bmp' [ ; 'quality' ; [0,100]|_1 ]]

data=: rgb writeimg 'jpeg'

Locale

These verbs are defined inside the jqtide (or ja for jandorid) locale, not exported to the z locale. To use them, either

• add jqtide to locale path

coinsert 'jqtide'
or
coinsert 'ja'

• qualify verbs with locale name

readimg_jqtide_
writeimg_jqtide_
or
readimg_ja_
writeimg_ja_