Thank you this report, I'll patch checkjqtversion to use sminfo instead. But the line should not reach if your versions of qt lib and qt add on match. I suspect you will get the same pop up message during running qtide. On Apr 20, 2015 8:42 PM, "Devon McCormick" <[email protected]> wrote:
> This looks like the same problem I had about a week ago with "plot". When > I load 'jpeg' from a jconsole under emacs, it freezes or kills my session. > > JVERSION > Engine: j803/2014-10-19-11:11:11 > Library: 8.03.13 > Platform: Win 64 > Installer: J803 install > InstallPath: d:/users/devonmcc/j64-803 > > Anyway, I think I figured it out: I have to load qt if I want the good > image readers and now the only thing that kills me is the penultimate > "checkjqtversion '' " line. I fixed this by changing the last line of that > to this: > > if. IFQT do. wdinfo 'JQt';msg else. smoutput msg end. > > Thanks for everyone's help. > > > > On Mon, Apr 20, 2015 at 10:12 AM, bill lam <[email protected]> wrote: > > > You have not told us your JVERSION or other system details, so that I > have > > no idea why Qt did not work for you. If Qt is available and you got > enough > > ram, I suspect decoding a MB jpeg will only take well less than 1 second, > > as Raul had witnessed. > > For the size of file with which I typically deal - nominally 20 MB > (5472 x > > 3648 pixel pictures) - it took about 5 hours to read one image. I'm > > looking to do better than this by a factor of 1000. I'll take a look at > > the pure J approach to get an idea if this is feasible. > > > > On Sun, Apr 19, 2015 at 11:41 PM, bill lam <[email protected]> wrote: > > > > > I made a patch to accept both APP0 and APP1, but did not attempt > > > to process any APP1 specific tags. That said, szies of jpeg from > > > DC or mobile phones are typically a few MB. It may take many > > > hours to decode with pure J if Qt is unavailable. > > > > > > Вс, 19 апр 2015, Raul Miller написал(а): > > > > Oh, yeah... I was just reading about that the other day: > > > > > > > > > > http://en.wikipedia.org/wiki/JPEG_File_Interchange_Format#Compatibility > > > > > > > > http://en.wikipedia.org/wiki/JPEG#JPEG_files > > > > > > > > http://fileformats.archiveteam.org/wiki/JPEG#Portability > > > > > > > > But then I got bogged down in the details of the huffman coding and > > never > > > > really did get around to figuring out anything that might be useful > for > > > > decoding the APP1 stuff that cameras tend to emit. > > > > > > > > It might be interesting, though, to take a look at one of these files > > and > > > > figure out at least enough of what they are doing to figure out how > to > > > make > > > > the readjpeg code happy. > > > > > > > > But without an example to work from, I useful progress might be > > > difficult. > > > > Everything I read suggests that jpeg is not so much a standard as a > > bunch > > > > of slightly incompatible standards with ad-hoc practices that tend to > > > work > > > > but which necessarily do things outside the scope of the standards. > > > > > > > > Thanks, > > > > > > > > -- > > > > Raul > > > > > > > > > > > > On Sun, Apr 19, 2015 at 8:22 PM, bill lam <[email protected]> > wrote: > > > > > > > > > I think isjpeg checked for APP0 marker (JFIF -: 74 70 73 70 {a.) > > > > > > http://www.fileformat.info/format/jpeg/egff.htm > > > > > > > > > > Apparently your jpeg use APP1 instead. (Exif -: 69 120 105 > > > > > 102{a.) which pure J jpeg decoder does not support. > > > > > > > > > > Anyways I guess Qt should be capable of handling all these formats. > > > > > On Apr 20, 2015 7:35 AM, "Devon McCormick" <[email protected]> > > wrote: > > > > > > > > > > > Here is my kluge to accommodate the header my .jpgs have: > > > > > > > > > > > > isJpeg0_jjpeg_=: 4 : 0 > > > > > > *./ +./x +./ . = 0 1 2 3 6 7 8 9 10 { a.&i.^:(2=3!:0) 11{.y > > > > > > ) > > > > > > isJpeg_jjpeg_=: (255 216 255 224 74 70 73 70 0,:255 216 255 225 > 69 > > > 120 > > > > > 105 > > > > > > 102 0)&isJpeg0_jjpeg_ > > > > > > > > > > > > The imagemagick idea is no good - I'm dealing w/hundreds of files > > > per day > > > > > > and have a nice J process that was working well w/.jpgs until the > > > attempt > > > > > > to move to J8 broke it. I may have to go back to the old, > > > unsupported > > > > > > methods. > > > > > > > > > > > > > > > > > > On Sun, Apr 19, 2015 at 6:38 PM, bill lam <[email protected]> > > > wrote: > > > > > > > > > > > > > Please provide details how it failed to detect a vaild jpeg > file, > > > eg > > > > > > which > > > > > > > 9 bytes it read and what should be the 11 bytes. > > > > > > > > > > > > > > jpeg addon should automatically use Qt if available. Otherwise > it > > > use > > > > > > pure > > > > > > > J scripts. > > > > > > > > > > > > > > You could also use platimg or image3 addons of J602, however > they > > > are > > > > > no > > > > > > > longer maintained. > > > > > > > On Apr 20, 2015 3:26 AM, "Devon McCormick" <[email protected] > > > > > wrote: > > > > > > > > > > > > > > > All - > > > > > > > > > > > > > > > > I find my efforts to move fully onto J8 stymied by the > > inadequate > > > > > > support > > > > > > > > for .JPG image files in the jpeg addon. When I attempt to > > read > > > a > > > > > > valid > > > > > > > > file that can be read properly by at least 2 other > > applications, > > > I > > > > > get > > > > > > > the > > > > > > > > error "invalid JPEG file". The proximate cause of this error > > is > > > a > > > > > zero > > > > > > > > returned by "isJpeg" which is checking for 9 of the first 11 > > > bytes of > > > > > > my > > > > > > > > file to have specific values. > > > > > > > > > > > > > > > > I can kluge this to accept the headers of the files it's > > > currently > > > > > > > > rejecting but, in any case, this version of "readjpeg" is > > > > > > excruciatingly > > > > > > > > slow: it takes about 30 seconds to read in a file that's well > > > under > > > > > > 300K. > > > > > > > > > > > > > > > > Does anyone have any ideas for alternatives to the existing > J8 > > > jpeg > > > > > > > > reader? I'd prefer not to continue to use the old J7 > gtk-based > > > ones > > > > > > but > > > > > > > > see no other way for now. > > > > > > > > > > > > > > > > Thanks, > > > > > > > > > > > > > > > > Devon > > > > > > > > > > > > > > > > -- > > > > > > > > Devon McCormick, CFA > > > > > > > > > > > > > > > ---------------------------------------------------------------------- > > > > > > > > For information about J forums see > > > > > http://www.jsoftware.com/forums.htm > > > > > > > > > > > > > > > > > > ---------------------------------------------------------------------- > > > > > > > For information about J forums see > > > http://www.jsoftware.com/forums.htm > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > -- > > > > > > Devon McCormick, CFA > > > > > > > > > ---------------------------------------------------------------------- > > > > > > 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 > > > > > > > > > > > -- > > Devon McCormick, CFA > > ---------------------------------------------------------------------- > > For information about J forums see http://www.jsoftware.com/forums.htm > > ---------------------------------------------------------------------- > > For information about J forums see http://www.jsoftware.com/forums.htm > > > > > > -- > Devon McCormick, CFA > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
