The links below have instructions for deleting photos.
iOS and iPod: Syncing photos using iTunes
iPad Tip: How to Delete Photos from Your iPad in the Photos App
Another Way to Quickly Delete Photos from Your iPad (Mac Only)
How to Delete Photos from iPad
How to: Batch Delete Photos on the iPad
(With iOS 5.1, use 2 fingers)
How to Delete Photos from iCloud’s Photo Stream
I Have also a special problem. On my pad I have several pictures without trashcan symbol, so it is impossible to remove it from my pad. Connect it to another PC or Mac with Itunes everyone says. Ok, so I did. The pad is showing up like a camera in Itunes, but when i am opening the pad and are looking after photos, there are nothing. All the photos I can see on my pad, I am not able to see it in Itunes!
this is special is everyone saying, and they have no solution on my problem.
ANyone here who can help me?
Were the photos originally synced from your computer ? If they were then connect the iPad to your computer and select it on the left-hand sidebar of your computer's iTunes, and on the right-hand side there should be a Photos tab - select that tab and you can then select which photo folders to sync. If you want to remove all synced photos then try selecting and syncing just an empty folder on that tab.