It all depends on the size of the browser window that you're using, because if the image can't fit in your browser window, it will automatically be scaled to as large as possible within the current browser window you're using, which can often affect the readability of text in a screenshot.

On some browsers, such as Firefox, middle-clicking on the image thumbnail will open it in a new tab. On others you can right-click and choose to "open link in new tab" or something to that effect. That said, I don't really like the default way images are displayed right now, particularly when trying to view DaniWeb on older computers.

One workaround when attaching images yourself is to use the [attach]number[/attach] tags (where 'number' is the attachment number). When posted, it actually bypasses the regular image viewing scheme and will automatically open the image in a new window (or a new tab, depending on your configuration). For example:

picture003.jpg