Hi Mike,
You are right and wrong, only the high contract prepress camera lens has the resolution that you mention. And the scanner with 15000ppi(around 600ppm)is for the use of electronic/chip industry and not for color film scanning. To take 6M pixels in 36x24 film, it is equel to 83 pixel per mm (pixel mean the spot with RGB information). DO you mean 40M file (RGB Tiff) or 40M pixels file (=120M file RGB Tiff)? By the way, if you would like to scan the color of each dye on each layer of film, you may need a higher for 135film (as the Pro Photo CD resolution). But as I state before the "image information" is still around 20M (a group of dye particles carry same set of information due to limit of lens resolution). Kodak has the extensive study in determine which is the optimal resolution for film scanning when Kodak developed PhotoCD system and what I write here was the summary from the result.
CCD is a hot items during these ten year and ton of money had been spent in new CCD technology. So the SN is better and so the dynamic is now better than several year ago. Here is a good ex&le. Imacon scanner is the professional scanner using CCD technolgoy and for desktop publishing. They using Three Ccd for different color scanning. Between the CCD and the film is a ultra high resolution lens for focusing and fit for different size of film. For 35mm film, the high resolution is 222ppm. I do have the experience in checking several scanner with the same scanning resolution, they produce different resolution image. Some scanner need to increase scanning resolution in getting compartable image. There are too many factors affecting the image. But please chk to scan b/W image using color mode to cross chk if the scanner is using color moasic filter over the ccd and do the interpolation color information.
In designing CD audio, the enginner of Philips using a lot of effort in squeezing 70mins audio information into 650M disk so they need to give up many thing such as the information between each s&le data (the information inbetween the s&le is reconstructed afterward. Audio is analog signal and record in digital media. High s&le freq means more accurate reflect the sound. Bit equals to dyanamic of scanner. True is that SACD produces better sound. However, in scanning industry, drum scanner already be here more than 15 years and there is not the issue as cd audio development.
Last but not least, there is a different theory about the film resolution. The true is that the resolution of movie film is not very high. But the random pattern of dye in different frame makes the preceive resolution of the projection image become very high. The IEEE image is for digtal film production and need 32bit (even 48).
You are right and wrong, only the high contract prepress camera lens has the resolution that you mention. And the scanner with 15000ppi(around 600ppm)is for the use of electronic/chip industry and not for color film scanning. To take 6M pixels in 36x24 film, it is equel to 83 pixel per mm (pixel mean the spot with RGB information). DO you mean 40M file (RGB Tiff) or 40M pixels file (=120M file RGB Tiff)? By the way, if you would like to scan the color of each dye on each layer of film, you may need a higher for 135film (as the Pro Photo CD resolution). But as I state before the "image information" is still around 20M (a group of dye particles carry same set of information due to limit of lens resolution). Kodak has the extensive study in determine which is the optimal resolution for film scanning when Kodak developed PhotoCD system and what I write here was the summary from the result.
CCD is a hot items during these ten year and ton of money had been spent in new CCD technology. So the SN is better and so the dynamic is now better than several year ago. Here is a good ex&le. Imacon scanner is the professional scanner using CCD technolgoy and for desktop publishing. They using Three Ccd for different color scanning. Between the CCD and the film is a ultra high resolution lens for focusing and fit for different size of film. For 35mm film, the high resolution is 222ppm. I do have the experience in checking several scanner with the same scanning resolution, they produce different resolution image. Some scanner need to increase scanning resolution in getting compartable image. There are too many factors affecting the image. But please chk to scan b/W image using color mode to cross chk if the scanner is using color moasic filter over the ccd and do the interpolation color information.
In designing CD audio, the enginner of Philips using a lot of effort in squeezing 70mins audio information into 650M disk so they need to give up many thing such as the information between each s&le data (the information inbetween the s&le is reconstructed afterward. Audio is analog signal and record in digital media. High s&le freq means more accurate reflect the sound. Bit equals to dyanamic of scanner. True is that SACD produces better sound. However, in scanning industry, drum scanner already be here more than 15 years and there is not the issue as cd audio development.
Last but not least, there is a different theory about the film resolution. The true is that the resolution of movie film is not very high. But the random pattern of dye in different frame makes the preceive resolution of the projection image become very high. The IEEE image is for digtal film production and need 32bit (even 48).