"an image form" is correct and usable in written English.
You can use it to refer to a physical or digital form that requires an image as a part of the information that it is requesting. For example, "I had to fill out an image form with a picture of my passport."
(a) Image formed by a spherical glass bead with a single refractive index, showing the blurring resulting from spherical aberration.
"Light was flashed, a sheet of paper was placed in a tray of water, an image formed.
Image formation is concerned above with incoherent object illumination, which results in an image formed by the addition of intensities.
It also includes optical data processing, which involves the manipulation of the information content of an image formed by coherent optical systems.
Prism Skylabs says on its Web site that it has developed a technology that eliminates people's faces and bodies from an image, forming a ghost-like shape that completely protects the privacy of customers.
It is often important to be able to calculate the brightness of an image formed by an optical system, because photographic emulsions and other light receptors cannot respond satisfactorily if the light level is too low.
The book also celebrates the technical achievements of the French, starting with the shadowy images of Louis Jacques Mandé Daguerre, who invented photography when he succeeded in fixing an image formed inside a camera on a silver plate.
A developed out silver gelatine photograph is composed of an image forming layer, a binder and a support layer.
Making use of these lenses, we build an anamorphic one-dimensional processor and evaluate its performance as an image forming system for flat objects.
