Click and Drag your Mouse to read whats missing ....
Even if an app doesn't support brightness or contrast changes that contains text on the iPad, the accessibility options screen in Preferences will allow for inverted video for those who need or desire that kind of contrast or white to black ratio on the screen.
:ipad-case:I use it and have it set to triple click the home button for accessibility mode to show the inverted video.. and can then be turned on or off without actually leaving the app. So it's pretty sweet, even for some apps without text, just to be able to see an inverted image of the same app.:ipad-case:
Hint: if a photo is taken while in this mode.. the photo is still in original color, its just that your viewing inverted video mode and as soon as you return to normal viewing you will see that the camera did capture all of the color with the photo data.