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
>
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