Re: Performance and file-size with embedded images

I'm afraid there currently is no simpler way to compress the bitmaps.  I
can make an ipelet that compresses all bitmaps in an Ipe document, but
it would require some support in Ipe itself.   If it can wait two weeks,
I can add this feature to the next version of Ipe.

Cheers,
 Otfried

On Tue, Nov 8, 2016, at 19:42, Nikolaus Rath wrote:
> Hi,
> 
> I tried appimage, and the slowness is indeed gone. Nice!
> 
> However, when I try to save the .ipe file it's as big as before. Do I 
> need to re-import all the .png images?
> 
> Best,
> -Nikolaus
> 
> On 11/07/2016 09:02 AM, Otfried Cheong wrote:
> > Hi Nikolaus,
> >
> > using Ipe 7.2.6 there is no slowness - the document seems to work just
> > fine.   I can select, zoom, and move around the plots in real-time -
> > there is no lag.
> >
> > Perhaps you could check if the newest Linux appimage solves your
> > problem.
> >
> > Cheers,
> >   Otfried
> >
> > On Mon, Nov 7, 2016, at 17:31, Nikolaus Rath wrote:
> >> Hi Otfried,
> >>
> >> Thanks, will try the new version!
> >>
> >> Did you have a chance to look into the slowness? Are you able to
> >> reproduce it?
> >>
> >> Best,
> >> -Nikolaus
> >>
> >> On 10/29/2016 01:04 AM, Otfried Cheong wrote:
> >>> Ah - you simply need to upgrade.  This was a bug where PNG figures where
> >>> imported without compression.
> >>> The problem was fixed in 7.1.9.
> >>>
> >>> I should still investigate what slows down Ipe so much.
> >>>
> >>> Cheers,
> >>>   Otfried
> >>>
> >>> On Sat, Oct 29, 2016, at 00:17, Nikolaus Rath wrote:
> >>>> Hi Otfried,
> >>>>
> >>>> Thanks for the quick response! These are line plots, so they should
> >>>> compress very well. Each individual image is between 100 kB and 300 kB.
> >>>>
> >>>> I'm on Linux 4.7 and ipe 7.1.8, and there is plenty of memory available
> >>>> (32 GB total, 2.3 GB free (not including buffered/cached)).
> >>>>
> >>>> I'll send you the document in a private email.
> >>>>
> >>>> Best,
> >>>> -Nikolaus
> >>>>
> >>>> On 10/28/2016 03:00 PM, Otfried Cheong wrote:
> >>>>> When you increase the resolution in both x- and y-direction by a factor
> >>>>> three, the number of pixels increases by a factor nine. That seems
> >>>>> pretty much in line with your numbers.
> >>>>>
> >>>>> What kind of pictures are these? Apparently they do not compress well.
> >>>>> You couldn't use JPG images?
> >>>>>
> >>>>> You don't say what OS you are on. The drastic slow-down might be because
> >>>>> Ipe doesn't get enough memory to keep everything in memory and starts
> >>>>> thrashing. But this is definitely something that should be investigated:
> >>>>> When you select an image, it does not get redrawn, and the backing
> >>>>> bitmap should not need to be accessed.
> >>>>>
> >>>>> Would you be willing to upload your document somewhere so I can have a
> >>>>> look?
> >>>>>
> >>>>> Cheers,
> >>>>>   Otfried
> >>>>>
> >>>>>
> >>>>> On Fri, Oct 28, 2016, at 23:31, Nikolaus Rath wrote:
> >>>>>> Hello,
> >>>>>>
> >>>>>> I have an ipe document that contains about 15 images in .png format,
> >>>>>> rendered at 100 dpi. This document takes 16 MB as .pdf and 21 MB as
> >>>>>> .ipe, and can be edited smoothly.
> >>>>>>
> >>>>>> However, when I replace the images with higher resolutions (300 dpi),
> >>>>>> then the file size changes to 183 MB for .ipe, and 135 MB for .pdf.
> >>>>>> Furthermore, even just selecting an image with a single click takes
> >>>>>> several seconds. The document becomes essentially un-editable.
> >>>>>>
> >>>>>> Why is this? Shouldn't the file size grow at most by a factor of 3, if
> >>>>>> the image resolution is increased by this factor? And why this extreme
> >>>>>> slowdown?
> >>>>>>
> >>>>>>
> >>>>>> Thanks,
> >>>>>> -Nikolaus
> >>>>>> _______________________________________________
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> >>>>>> http://lists.science.uu.nl/mailman/listinfo/ipe-discuss
> >>>>> _______________________________________________
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> >>>>>
> 
> 
> -- 
> Nikolaus Rath, Ph.D.
> Senior Scientist
> Tri Alpha Energy, Inc.
> +1 949 830 2117 ext 211
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