[OpenLayers-Users] Image layer maximum file size?

[Lisa Gaudette]

I am trying to display pre-generated map images using an image layer;
these maps are to be used from the local machine.

 

The first set of images was created for a fairly small area at 5000 x
2500, with the images under 100kb each. I have had no problems
displaying these images. Then I had a set (representing a different,
much larger, area) that I made at 10000 x 12725 (~850kb). I could not
get it to display. I thought for a while that maybe it had something to
do with the height being greater than the width, but then I tried
creating that set at half the size 5000x6326 (~270kb), and things
worked. I then thought that perhaps a dimension over 10,000 was some
sort of maximum, so tried making them at 7800x9925 (~545kb). Didn't
work. There are no apparent errors, the image simply doesn't display.
When I right click in the map area and pick properties, it would seem
like the browser (IE - this must work with IE) thinks the image is there
and I get information about it (e.g. the correct address, size: 558646
bytes, Dimensions: 780x992 pixels).

 

For a simple code example, this is my modified version of the init()
function from the image-layer.html example:

 

        var map;

        function init(){

            map = new OpenLayers.Map('map');

 

            var options = {numZoomLevels: 6, maxResolution: 10};

            var imgWidth = 7800;

            var imgHeight = 9925;

            var graphic = new OpenLayers.Layer.Image(

                'Test',

                '/Maps/SK2/S/2/1588.png', // File size is 545kb

                new OpenLayers.Bounds(0, 0, imgWidth, imgHeight),

                new OpenLayers.Size(imgWidth, imgHeight),

                options

            );

            

            map.addLayers([graphic]);

            map.zoomToMaxExtent();

        }

 

Is this some maximum file size that it can load? Or perhaps some other
issue?

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