Reading/writing image files can be provided by different facilities, there is no unique addon that can work (or work optimally) in all scenario. If you are using jqt, readimg and writeimg should work best.
http://code.jsoftware.com/wiki/Guides/Window_Driver/Image Пн, 18 янв 2016, Devon McCormick написал(а): > Hi - > > As some of you may know, I use the J facilities for reading and writing > .JPGs quite a bit. However, for convenience, I've put together an "images" > script (as I believe there used to be) that incorporates the current set of > read/write verbs we have in J for .BMP,.JPG, and .PNG files (see below, > after my signature). So, I have a simple use of agenda to invoke the > correct reader or writer based on the suffix of the file name. This way, > whenever I work with a file in one of the supported formats, I can use the > same verb "read_image" that figures out which variety of I/O I need based > on the file suffix. > > I'm not sure who's been maintaining this underlying code but I noticed that > whereas the jpeg code used to have a global by which the default .JPG > quality is controlled (since it's a lossy format), the current version has > a default of 75 (75% where higher is better quality, less compression) > scattered throughout. This difference requires me to either change the > default within the jpeg script, which I did, or remember to specify it > every time I write jpeg images, which I don't want to do. > > So, my general question is how do I get my "images.ijs" cover verbs > included within the default J distribution? Along these lines, if I "fix" > the existing jpeg code to go back to using a global to control default > quality, what's the process for getting this change accepted into the > distribution? > > Thanks, > > Devon > > -- > > Devon McCormick, CFA > > Quantitative Consultant > --- > NB.* images.ijs: group various image format handlers to allow image > handling > NB. without regard to underlying type. > > coclass 'images' > require 'graphics/bmp' > require 'graphics/jpeg' > require 'graphics/png' > > extractSuffix=: ]}.~[:>:'.' i:~ ] > SUFFS=: 'bmp';'jpg';'png' > > read_image=: readbmp_jbmp_`readjpeg_jjpeg_`readpng_jpng_`] @. ((SUFFS i. [: > < extractSuffix) ]) > > write_image=: writebmp_jbmp_`writejpeg_jjpeg_`writepng_jpng_`] @. ((SUFFS > i. [: < extractSuffix) ]) > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm -- regards, ==================================================== GPG key 1024D/4434BAB3 2008-08-24 gpg --keyserver subkeys.pgp.net --recv-keys 4434BAB3 gpg --keyserver subkeys.pgp.net --armor --export 4434BAB3 ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
