Temporary storage of imagedata

Richard Miller wow at together.net
Mon Aug 24 09:24:54 EDT 2009


Mark,

Thanks! Works perfect.

Richard



Mark Smith wrote:
> Richard, the imagedata will tend to be a lot bigger (maybe 10x) than 
> the compressed image file, so you probably want to store <the text of 
> image "someimage">, and then <set the text of image "someimage" to 
> tStoredData[1]>.
>
> The text of an image is what would be in the file - ie. <the text of 
> image "someimage.jpg"> is the same as what you'd get from <get url 
> ("binfile:someimage.jpeg")>, whereas the imagedata is (I think) the 
> actual pixels that revolution displays.
>
> Other than that, I'd think your idea would work well.
>
> If you store the text of your images in an array, then you could 
> serialize the array with <arrayencode>, (and maybe base64encode the 
> result for transmission over the net).
>
> Best,
>
> Mark Smith
>
> On 24 Aug 2009, at 13:28, Richard Miller wrote:
>
>> This is for a revlet application.
>>
>> I'm looking at various ways to temporarily store image snapshots 
>> before displaying them in a stack. The objective is to record several 
>> hundred screen shots (one per second), store them temporarily, then 
>> put the images into a new stack, one image per card, for replay. The 
>> temporary storage process needs to occur very quickly, as the user is 
>> interacting with the main stack while the recording is taking place. 
>> Each snapshot is shot with a low jpegquality (30-40), as the file 
>> size of the final group of images must be kept to a minimum so it can 
>> be transferred fairly quickly over the net.
>>
>> Each image is averaging 30k. 100 images is 3 mb... which will work 
>> for this application. Right now, I am just saving each snapshot to a 
>> file, then at the end of the recording process, quickly putting each 
>> image onto a card. That whole saving-to-stack process takes about 10 
>> seconds or so, which is fine.
>>
>> I'm thinking it might be better/more elegant to store the imagedata 
>> of all the images into one variable (rather than to separate files), 
>> but I'm not sure how best to store this data (since it is binary and 
>> contains many lines per image). Then, at the end of the recording, I 
>> could transfer just this data over the net (stored as one binary 
>> file), then either create a display stack containing one image per 
>> card, or maybe even better, just create one card with one image "on 
>> the fly", pulling the data for each image from this data variable.
>>
>> Thoughts?
>>
>> Thanks.
>> Richard Miller
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