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Date Posted: 10:50:47 05/04/04 Tue
Author: Mike B
Subject: Re: Memory usage
In reply to: Mike B 's message, "Re: Memory usage" on 01:11:18 04/24/04 Sat

Hello?

>I've been out of town, sorry for the delay. My
>requirements are to view, zoom, scroll, and print usgs
>drg files (geotiffs). I also use the area selection
>feature, but it is not vital. The memory issue is
>compounded for me because of the very large size of
>the tiff files (12mb average and something like 7000 x
>5500 (off the top of my head)). Those are industry
>standard files, used in many GIS applications. The
>stripped down version may be what i need, but you can
>probably answer that more than I. Thanks for any
>ideas.
>
>>
>>Hi Mike,
>>
>>I am aware of this, but have not found the best
>>solution yet. Since annotations have been introduced
>>the memory consumption has increased because the
>>annotations are drawned on the displayed graphic, so
>>the displayed graphic cannot be for example, black and
>>white.
>>
>>It has been suggested to use TImage directly but then
>>you lose the features of the TImageScrollBox.
>>
>>The ideal solution is to break down the image into
>>tiles and only work with it one "tile" at a time, but
>>this is very complex, for displaying and applying
>>transformations.
>>
>>A possible option is to have an option in
>>TImageScrollBox to work in a more lightweight mode,
>>without annotations and possibly removing some other
>>features. Or, another display component with less
>>features. What are you requirements?
>>
>>Best regards,
>>
>>Michel
>>
>>>I know this has probably been covered many times
>>>before, but I need to know some options. Envision
>>>uses massive amounts of memory (depending on image
>>>size, of course). I understand that it is because
>the
>>>entire image is in memory, but this is killing me.
>>>Opening a given map in my software at 100% is using
>>>upwards of 350MB of memory in the task manager.
>Using
>>>a competitors software, the same image uses about
>48MB
>>>- zooming does not effect this. Otherwise their
>>>software sucks, but there is no way mine is going to
>>>work worth a damn on anything but high end computers.
>>
>>> So how do they do that and what are my options with
>>>Delphi? Thanks.

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Replies:

  • Re: Memory usage -- Michel, 06:31:41 05/08/04 Sat
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