It’s very strange that the same picture display different on PC/Mac/iOS device.
This URL of a picture:
http://imgtest.meiliworks.com/pic/d/b3/0d/1a6157b2828bbcbfadb0d4d114b0_600_2400.jpg
it’s 77×310 in safari on Mac OSX 10.7,
but it’s 310×77 in safari on iPad!
if I download the picture and open it directly, it’s become 310×77.
what’s wrong with my picture?
Your image contains an EXIF orientation tag with the value of 6 (rotated 90 degrees left). Not all image viewers handle this tag properly. For those that don’t respect it, they’ll display the image rotated 90 degrees right.