In the TSFE there's an array called "lastImageInfo", that contains info about the last image accessed.
Using that, it's possible to extract the height, width, type and url of the image..

Check out this example snippet.
Remember to change the reference to the image:

10.file = fileadmin/images/testimage.jpg

To an image on your server..

10 = IMAGE
10.file = fileadmin/images/testimage.jpg
10.wrap = |<br />

20 = TEXT
20.data = TSFE:lastImageInfo|0
20.wrap = The width of the above image=|<br />

30 = TEXT
30.data = TSFE:lastImageInfo|1
30.wrap = The height of the above image=|<br />

40 = TEXT
40.data = TSFE:lastImageInfo|2
40.wrap = The type of the above image=|<br />

50 = TEXT
50.data = TSFE:lastImageInfo|3
50.wrap = The url of the above image=|<br />
}
page.123 < lib.imageInfo

Related snippets:

Fun with TSFE Part 1: Getting additional IMAGE imformation

Fun with TSFE Part 2: Getting additional typolink information

Fun with TSFE Part 3: Getting client information

Fun with TSFE Part 4: Other useful information

This snippet was submitted by Peter Klein

Comments

Thomas, 26-05-07 19:15:

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At least with the most recent versions of Typo3 (>=4.0), the same information is available for IMG_RESOURCE:
Just take TSFE:lastImgResourceInfo instead of TSFE:lastImageInfo; and you'll get pretty much the same for IMG_RESOURCE.
This might become useful especially if you need to write an image URL to the output, and you need some more data (e.g., dynamic creation of CSS with background-image:url() with the need to write an min-midth:$foopx; in order to be sure to show the entire image).

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