According to pdfimages -j, the PDF in URL contains a 292 MB image (https://it.wikipedia.org/wiki/Diego_Vel%C3%A1zquez#Las_Meninas ):
$ exiftool -fast2 cotton--014.jpg
ExifTool Version Number : 9.70
File Size : 292 MB
File Type : JPEG
MIME Type : image/jpeg
JFIF Version : 1.01
Resolution Unit : inches
X Resolution : 600
Y Resolution : 600
Image Width : 26065
Image Height : 30000
Encoding Process : Baseline DCT, Huffman coding
Bits Per Sample : 8
Color Components : 3
Y Cb Cr Sub Sampling : YCbCr4:4:4 (1 1)
Image Size : 26065x30000

Several other images are in the megabytes, but order(s) of magnitude less (the following is in blocks).
$ ls -s1S
totale 409448
299208 cotton--014.jpg
10208 cotton--078.jpg

8504 cotton--040.jpg
8056 cotton--008.jpg
7384 cotton--028.jpg
6620 cotton--012.jpg
5368 cotton--089.jpg
4948 cotton--035.jpg
3660 cotton--009.jpg
3568 cotton--022.jpg
3048 cotton--007.jpg
3040 cotton--010.jpg
2584 cotton--067.jpg
2388 cotton--047.jpg
2220 cotton--069.jpg
2180 cotton--019.jpg
2100 cotton--038.jpg

Version: unspecified
Severity: normal
URL: https://it.wikipedia.org/w/index.php?title=Speciale:Book/render_collection/&colltitle=Wikipedia:Libri/Cotton_selected