[Ipe-discuss] Performance and file-size with embedded images

[Otfried Cheong]

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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> 
> 
> -- 
> Nikolaus Rath, Ph.D.
> Senior Scientist
> Tri Alpha Energy, Inc.
> +1 949 830 2117 ext 211
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