Re: Performance and file-size with embedded images

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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>>>>>


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