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Buffer object and image buffer object in OpenCL

What is the difference between a buffer object and an image buffer object in opencl? Obviously, the image buffer is faster, but to what extent? Where should they be used?

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OpenCL Buffer is a 1D or 2D or 3D array in global memory. Its an abstract object that can be addressed through a pointer. Buffers are read-only or Write_only or Read-Write. The image buffer is the graphics memory of the GPU. It is an array of pixels, which can be accessed through functions that determine the coordinates of the pixels x, y, z. There is no pointer access to image pixels on the GPU.

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FYI, OpenCL 2.x, .

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