Well, the extreme way to eliminate thumbnails would be to uninstall GD…
After you upload an image, click (left click) on it and a little menu pops up. Select thumbnail and click again and thta kills the thumbnail for that image.
It’s not exactly what I mean.
When you upload an image it also uploads a thumbnail image with it. There should be an option to turn it off without having to uninstall GD which is just stupid.
To eliminate using thumbnails, you’ll have to tackle the core WP files.
First, look in inline-uploading.php. On line 364, you’ll want to replace:
oi.innerHTML = usingthumbnail;
with:
oi.innerHTML = usingoriginal;
Hope that helps you!
addenum:
If you prefer changing the thumbnail’s size, I wrote a response on this thread: http://wordpress.org/support/topic/60927?replies=6
Hope that resolves your problem.
I tried sjusc10’s solution. It doesn’t work. However, I found another solution. It taught you to take off all default width-height img src tag. Look this article http://wordpress.org/support/topic/56985?replies=26
I came across another problem which might be the reason sjusc10’s solution isn’t working. Have a look at this thread:
wordpress.org/support/topic/74794
Please, WordPress team, handle that officially! People in the forum keep on discussing and wishing for that feature all over! They all are hacking around for themselves. What we need is a clean and simple solution like an option in the preferences that would not be so hard to implement.
http://trac.wordpress.org/ticket/2391
Thank you so much!