Why is 640 pixels in CD not = to 640 pixels on a web page?

[Guest_imported]

I have created a 3-d text headline in Corel Draw Graphics Suite 9. Both the page size and page setup have been set at 640 x 438 pixels. On a web page 640 pixels is almost a full screen wide but in CD it's only a little over 2 inches wide. So, why is a pixel not a pixel? And, what do I have to do to get my 3-d text exported to gif or jpg and then imported to my web page at a full 640 web page pixels (that is, almost an entire page wide? When I tried to do it, the 3-d comes into the web page at about 50 to 100 pixels.

 

[mbj]

Check the resolution of your image.  If it is higher than 72 dpi then it will display smaller.  Make sure that when you export your image that it is 640 pixels at 72 dpi.

 

[boxplan]

(I don't have Corel 9, however I find the following to be true in Corel 8)<br><br>Three thoughts:&nbsp;&nbsp;<br><br>1.) When you export to a GIF image you must reset the image size to 1 to 1(aka 100%).&nbsp;&nbsp;Once this has been done you can specify an image size.&nbsp;&nbsp;This must be done for EACH image.<br><br>2.) View the image in a graphics viewing program.&nbsp;&nbsp;It would tell you what the pixel size of the image is.<br><br>3.) Check the view properties in Corel.&nbsp;&nbsp;Are you viewing at a lesser percent in Corel but at 100% with your viewer.<br><br>boxplan

 

[Guest_imported]

Thanks to both mbj and boxplan.&nbsp;&nbsp;I'll give your suggestions a try today.&nbsp;&nbsp;In the meantime I'm still curious as to &lt;why&gt; the resolution affects the units of measurement so much.&nbsp;&nbsp;I just discovered that if I set layout/page setup/page size/width=640 and height = 438 and resolution = 300 dpi, the 640 equates to exactly 2.25 inches.&nbsp;&nbsp;If I change the resolution to 72 as suggested by mbj the 640 then equals almost 8.5 inches.&nbsp;&nbsp;It's easy to see the effect now that it's been pointed out to me but I don't understand the why of it.&nbsp;&nbsp;If anyone has the time to explain it, I'd be grateful.&nbsp;&nbsp;If not, I thank you both again for the tips - now at least I can get my drawings to export and import at the right sizes.&nbsp;&nbsp;

 

[rycamor]

It's a question of measurement orientation. In the world of print graphics, everything is measured by inches, and the resolution of the image is expressed in 'dots per inch'. On images meant for a computer screen (which is how you should think about web images) there is little question of how many dots you can get per inch, since a monitor is a pretty much fixed at somewhere between 72 - 96 pixels per inch. So in graphics meant for the computer screen, you should think only in terms of how many pixels accross and down the image is, and then imagine about how many inches that would approximate on a computer monitor (which varies depending on the monitor).

 

[Guest_imported]

Ahhhhhh!&nbsp;&nbsp;&nbsp;&quot;I see!, said the monkey when they cut off his tail.&quot;&nbsp;&nbsp;(One of my father's favorite expressions -- kind of equates to &quot;duh!&quot; today.&nbsp;&nbsp;Amazing how simple it is once it is properly explained -- even I can get it.&nbsp;&nbsp;My thanks to rycamor.