One of the reasons that few clients prefer specific photo editing services for bulk work is because the outsourcing firm is able to meet the strict deadlines. This is possible only if certain risk factors are tackled in advanced.
Meeting strict deadline with Image Manipulation Service for bulk pictures is one of the major criterions why ad agencies cherry-pick professional photo processing firms. When a deadline is missed it is a huge risk that can get the agency fired from handling a prestigious account. For the main client the message may no longer have a meaning if the artwork is delayed and processed after the deadline is missed. Some ads are topical and need to appear in print or web or on the posters or brochures on particular dates only. It could well be a New Year message or a greeting. It could also be an important product launch coinciding with the festival or an important event. There are several such needs that a client might have and need work to be done on strict timelines.
There are other reasons why deadlines have to be met on a professional level for a company to survive in the market. And one can rely on the professionals to do the work on time without ruining the quality of the artwork. An in depth skill to make a meaningful manipulation on bulk pictures is a focused job even for the trained person. If an advertisement is being created it (the illustration and the text) can be a driving force. A well-trained graphic artist is creative enough to sense how to use the craft to his advantage. When you have strict deadline to meet then it is a wise decision to choose professional Image Manipulation Service. It deals with color correction, adding more images, graphics or montage to an existing creative.