You were correct that I should be using the jqtide functions: readimg_jqtide_
writeimg_jqtide_ I still have a couple of questions though.1. Why are the pixel values (in the matrix) negative? This seem odd.2. If I load an image using readpng, I cannot then save it using writeimg_jqtide_. The resulting bitmap cannot be read by any program on my computer (at the time I tested this I was using a Mac).Is this behavior expected? Thanks,Jon> Date: Tue, 21 Oct 2014 23:35:00 +0800 > From: [email protected] > To: [email protected] > Subject: Re: [Jprogramming] Bitmaps and Image addons > > The png addon in j803 can read and write png. > > require 'png' > png=: readpng jpath '~temp/viewmat.png' > > for jpeg, it depends on which platform you are using, you may use > image3 as what Devon had suggested. > > Why do you avoid Qt? > > Вт, 21 окт 2014, Jon Hough написал(а): > > Scratch that. Using the QT functions I can get what I want.I would like to > > know if I can read JPEG and PNG files without the jQT functions. > > > > > From: [email protected] > > > To: [email protected] > > > Date: Tue, 21 Oct 2014 15:36:24 +0100 > > > Subject: Re: [Jprogramming] Bitmaps and Image addons > > > > > > I'm not sure how I would use the jQT functionality. I want to get the > > > matrix representation of a jpeg or png file.e.g. I have a jpeg file > > > cat.jpg > > > > > > require 'bmp';'graphics/bmp' > > > > > > > > > > > > > > > > > > ]bmp =. readbmp jpath '~/cat.jpg' > > > > > > > > > > > > not a bitmap file > > > > > > > > > J claims it is not a bitmap file. I want to get the RGB(A) pixel values > > > of the file. > > > > > > > > > > > > > Date: Tue, 21 Oct 2014 16:28:35 +0900 > > > > From: [email protected] > > > > To: [email protected] > > > > Subject: Re: [Jprogramming] Bitmaps and Image addons > > > > > > > > It looks like rgb ----->bgr > > > > > > > > --- Original Message --- > > > > > > > > From: "Jan-Pieter Jacobs" <[email protected]> > > > > Sent: October 21, 2014 4:16 PM > > > > To: [email protected] > > > > Subject: Re: [Jprogramming] Bitmaps and Image addons > > > > > > > > Thanks for the example, but the colors seem wrong in the images (at > > > > least > > > > on android). > > > > The top left one looks like it should, the others look too blueish. > > > > maybe > > > > an error in converting between ints and rgb triplets? > > > > > > > > Jan-Pieter > > > > On 21 Oct 2014 05:51, "bill lam" <[email protected]> wrote: > > > > > > > > > the qt image demo of j803 beta have been updated to > > > > > include examples of reading and writing image files. > > > > > > > > > > Пн, 20 окт 2014, Jon Hough написал(а): > > > > > > I am interested in using J with png and jpg files. But cannot get > > > > > > the > > > > > bmp addon to work with them.I noticed this in the wiki: > > > > > > http://www.jsoftware.com/jwiki/Addons/media/image3 > > > > > > But cannot find the image3 addon anywhere in J802. > > > > > > Any ideas? > > > > > > Regards. > > > > > > ---------------------------------------------------------------------- > > > > > > 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 > > > > ---------------------------------------------------------------------- > > > > For information about J forums see http://www.jsoftware.com/forums.htm > > > > ---------------------------------------------------------------------- > > > > For information about J forums see http://www.jsoftware.com/forums.htm > > > > > > ---------------------------------------------------------------------- > > > For information about J forums see http://www.jsoftware.com/forums.htm > > > > ---------------------------------------------------------------------- > > 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 ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
