cactuspic wrote:
Cat, I think it's the quality of the 8MP that's involved and it's not just the total number of megapixels. For example, suppose I took two images with the same 8MP camera body but with two different lens, the first a crappy lens and the second pro quality lens. Nobody would be surprised if the image with the pro lens was sharper than the one take with the crappy lens even though both images are the same 8MP. Depending on the subject, lighting, atmospheric condition etc those differences can be more or less noticeable.
Taking the situation that you posed, a 24MP body and a 12MP body, the 12MP body will capture less detail than the 24mp body. When the 12Mp image is reduced to 8MP, the details that were lost will not appear in the final image. When the 24MP image is reduced to 8MP, some of the details that are in the 24MP capture(but not in the 12 MP) will remain in the 8MP print. It's the amount of detail that is contained in the 8MP print. Just as in the case of a crappy lens against a pro lens, the amount of detail captured and sent to the printer may yield differences in sharpness.
I hope that made sense.
Cat, I think it's the quality of the 8MP that's in... (
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Only makes sense if whatever processor is selecting the bits to send to the printer is doing a better job selecting what bits to send with the 24 meg file than the 12 meg file. It would make sense then that the very best file to print, in terms of accuracy of detail, would be one whose pixel count exactly matches the ink dot count, so that EVERY pixel is represented in the print. That would remove the uncertainty inherent in the process.