Reply to thread

Message

<blockquote data-quote="WayneF" data-source="post: 479136" data-attributes="member: 12496">Thanks Bob.&nbsp; I actually thought a few would be interested...&nbsp; It is a first basic of the digital concept. Digital and film are just very different concepts.&nbsp; Both do have to reproduce the small lens image for enlarged viewing, but the methods are extremely different.This was a CCD scanner, which has a lens in it, focusing the 8.5 inch glass bed onto about a 2 inch digital sensor, like the camera does, which then samples it with normal digital sampling, like the camera does.&nbsp; This one was a high priced consumer scanner, but all CCD scanners work alike.Scan resolution (the sampling) depends on the goal.&nbsp; If trying to copy a photo print at original size, scanning at 300 dpi and printing at 300 dpi does that, as well as the size can use.&nbsp; More cannot help the small final size. The scanner is not limited, but the printer is.&nbsp; And the original photo print doesn't have greater detail in it anyway (film has much more... enlargement is the goal of film, but the human eye is the goal of a print).Same with our cameras,&nbsp; IF the only goal is to view it full screen on the computer screen, or print a 4x6 print (both about 2 megapixels), then 24 megapixels is overkill (for that small purpose).&nbsp; Again, it is the goal and the display that is limited.But if we want to reproduce all the detail the lens can create, then we need a lot of pixels. Significantly more than the goal might indicate to some.&nbsp; &nbsp; 10Gauge got it right just before me.</blockquote>

[QUOTE="WayneF, post: 479136, member: 12496"] Thanks Bob. I actually thought a few would be interested... It is a first basic of the digital concept. Digital and film are just very different concepts. Both do have to reproduce the small lens image for enlarged viewing, but the methods are extremely different. This was a CCD scanner, which has a lens in it, focusing the 8.5 inch glass bed onto about a 2 inch digital sensor, like the camera does, which then samples it with normal digital sampling, like the camera does. This one was a high priced consumer scanner, but all CCD scanners work alike. Scan resolution (the sampling) depends on the goal. If trying to copy a photo print at original size, scanning at 300 dpi and printing at 300 dpi does that, as well as the size can use. More cannot help the small final size. The scanner is not limited, but the printer is. And the original photo print doesn't have greater detail in it anyway (film has much more... enlargement is the goal of film, but the human eye is the goal of a print). Same with our cameras, IF the only goal is to view it full screen on the computer screen, or print a 4x6 print (both about 2 megapixels), then 24 megapixels is overkill (for that small purpose). Again, it is the goal and the display that is limited. But if we want to reproduce all the detail the lens can create, then we need a lot of pixels. Significantly more than the goal might indicate to some. 10Gauge got it right just before me. [/QUOTE]

Verification