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

[Nikolaus Rath]

Hi Otfried,

No worries, I can re-import them. I just wanted to make sure that it's 
*intended* to be done manually.

Thanks for your help!

Best,
-Nikolaus

On 11/08/2016 11:54 AM, Otfried Cheong wrote:
> 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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>>
>>
>> --
>> Nikolaus Rath, Ph.D.
>> Senior Scientist
>> Tri Alpha Energy, Inc.
>> +1 949 830 2117 ext 211
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