It’s common to shoot business portraits against a seamless background. Photographers will often add a tonal gradient instead of using this flat-toned background. This gradient helps create depth, making the subject stand out more distinctly from the background.
But when the final image is saved as a JPEG, the file compression can cause the gradient to posterize, especially if the gradient was steep. Posterization occurs when the smooth transition of tones is replaced by abrupt colour shifts or banding. A small amount of posterization won’t be noticeable to the customer and won’t be visible in print or online images.
Low JPEG settings (high compression) make posterization more apparent, while the highest JPEG settings can minimize it. But if a customer needs a small file size, using a high-quality JPEG setting may not be feasible.
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