Re: Image size question

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On Sun, 03 Apr 2005 08:25:09 -0700, Brock Allen
<ballen@xxxxxxxxxxxxxxxxx> wrote:

>I have a sample app that does exactly that:
>
>http://staff.develop.com/ballen/blog/PermaLink.aspx?guid=2d8b430b-8361-416d-9df8-9aff48bf2481
>
>I'd suggest reading the comments for the blog entry and there's a link off
>to more help on the image resizing bit.
>
>-Brock
>DevelopMentor
>http://staff.develop.com/ballen
>
>
>
>> I have an app that has many subdirectories containing one or more
>> images (jpg, gif, bmp). When the user selects a directory, my plan is
>> to show the images if there are only one or two, or show thumbnails if
>> there are more and allow the user to click on each thumbnail to view
>> it full size.
>>
>> Right now I'm just sticking an <IMG> tag for each image into a literal
>> control. It works fine but the images are huge which surprised me. I
>> really don't know the size of the image in order to specify height and
>> width in the IMG tag. I tried loading them and checking the
>> image.height and width but, after around 6 or 7 it runs out of memory.
>> Very weird. I am disposing the image after each one is loaded.
>>
>> But that approach is very wasteful anyway. There can't be a need to
>> load each image just to get the browser to display it at the proper
>> size. Should I try adding image controls dynamically instead of
>> spitting out html? Am I missing the point entirely?
>>
>> The thumbnail idea also presents the same problem. It seems wasteful
>> to load an image and generate the thumbnail in memory each time. I
>> guess I can check to see if the thumbnails exist and if not create
>> them. That way I only do it once or can even have a separate app do it
>> "offline".
>>
>> Any image assistance appreciated.
>>
>
>

Thanks. It will take me a bit to sort though this. Setting the
contextType:
ctx.Response.ContentType = "image/jpeg";

tells the browser not the expect a webpage but rather an image. And
this line:
img2.Save(ctx.Response.OutputStream,System.Drawing.Imaging.ImageFormat.Jpeg);

spits it out.

But does it appear somewhere in the current webpage or open up a new
window? And how would I attach JavaScript to trigger a request for the
full image?
.

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