Scanners: How many pixles
Apr 14, 2018 09:09:05 #
garygrafic
Loc: South Florida
I agree but again I say do not call yourself a photographer, a photographer shoots pictures, a person that keeps looking for ultimate in sharp lenses is a 'lens tester'.
Apr 14, 2018 09:13:36 #
Retina wrote:
Henri’s work was not always so dependent on sharpn... (show quote)
Exactly!
Its all about your values, and how you perceive the world.
Apr 14, 2018 09:36:05 #
LarryFitz
Loc: Beacon NY
PeterBergh wrote:
If memory serves, I saw a figure of 35 MP for Kodachrome 25; the figure was based on resolution. Since slide films are analog, there's no good way of comparing.
Your memory is good, a pixel can be broken down a a number. Film is a curve smooth analog curve. Scanner capture the information and assigns a number, but it can not assign a number of 234.456 or 234.789 they will be save as 234 and 235
Apr 14, 2018 09:54:55 #
LarryFitz wrote:
Your memory is good, a pixel can be broken down a a number. Film is a curve smooth analog curve. Scanner capture the information and assigns a number, but it can not assign a number of 234.456 or 234.789 they will be save as 234 and 235
Amplitude resolution also depends on the # of bits the system uses, for 12 bits there are 4096 discrete values that can be represented, for 14 bit its 16,384 discrete values, and for 8 bits its 256 values. The formula is 2^(number of bits).
Apr 14, 2018 10:00:07 #
LarryFitz wrote:
Your memory is good, a pixel can be broken down a a number. Film is a curve smooth analog curve. Scanner capture the information and assigns a number, but it can not assign a number of 234.456 or 234.789 they will be save as 234 and 235
DaveC1 wrote:
Amplitude resolution also depends on the # of bits the system uses, for 12 bits there are 4096 discrete values that can be represented, for 14 bit its 16,384 discrete values, and for 8 bits its 256 values. The formula is 2^(number of bits).
This relates to color depth {how many colors can be displayed} - not sharpness{how many pixels are captured}
Apr 14, 2018 11:48:32 #
The pixel equivalent for film would be silver halide grain size. When the silver halide precipitates from the liquid it grows cubic crystals. Film-makers endeavored to control grain sizes thus enabling 'slow' to 'fast' film. When the film is processed a single grain accounts for a single clump of silver. The clump blocks passage of light, so if the collection of clumps replicates an image you have a 'negative' of the image. Making a positive is straightforward.
Apr 14, 2018 12:36:25 #
rehess wrote:
This relates to color depth {how many colors can be displayed} - not sharpness{how many pixels are captured}
Please note I said amplitude resolution. That was intended as a general comment on how digital systems scale with the number of bits.
Apr 14, 2018 12:47:53 #
Apr 14, 2018 12:48:22 #
Rickyb wrote:
How many pixels are there in Kodachrome and other slide films? What about color negs and BW negs? There is a differential.
Your question is vague
Film is analog so doesn't have pixels per say. I believe, since you have scanner in your title, you are asking what to scan at? if so, 300 minimum, but if you have the room for storage, as high as 600 or more (some say anything over 600 is wasted, and some say over 300)......But you can also take a pic of the slide with your DSLR.
Here are a couple of good articles on dpi/ppi and sizes
http://howtoscan.ca/scanning-tips/best-slide-scan-resolution.php
https://pic.templetons.com/brad/photo/pixels.html
Apr 14, 2018 12:51:30 #
garygrafic wrote:
I agree but again I say do not call yourself a photographer, a photographer shoots pictures, a person that keeps looking for ultimate in sharp lenses is a 'lens tester'.
...why can't I be a photographer and *also* look for sharpness in my work? You're so limiting...I can't be in your club (sniff...)
Apr 14, 2018 15:07:58 #
Apr 14, 2018 15:54:36 #
garygrafic
Loc: South Florida
I hope I'm not over simplifying this but here goes....you can't be in my club because I'm afraid that in your quest for 'sharp' you would reject some otherwise acceptable, interesting, well composed, pleasing and whatever attributes that would say "I must have this print on my wall". You might, I really do not know, reject a picture after seeing another that was sharper. If a picture turns me on sharpness or lack of it doesn't even enter the equation. To me, a photo just has to be sharp enough to get the job done. If the degree of sharpness in a photo is all one can talk about that photo should be trashed. I guess it all boils down to, what makes a good picture. Let's save that for another day.
Apr 14, 2018 16:02:40 #
Rickyb wrote:
How many pixels are there in Kodachrome and other slide films? What about color negs and BW negs? There is a differential.
None. Pixels are digital entities. Kodachrome depended on light exposing a random pattern of silver halide crystals embedded in an emulsion on a transparent film. Negative color films and B&W films are also silver halide based.
Apr 14, 2018 17:15:50 #
Retina
Loc: Near Charleston,SC
CatMarley wrote:
None. Pixels are digital entities. Kodachrome depended on light exposing a random pattern of silver halide crystals embedded in an emulsion on a transparent film. Negative color films and B&W films are also silver halide based.
Maybe the question was meant more along the lines of "What minimal pixel count is needed to digitize pictures made on Kodachrome and other films assuming some of the photos were made with decent lenses by a careful, or even lucky film photographer who took some really sharp pictures?" Even then, it assumes the person asking wants no loss of detail even if losing some would not detract from the overall photo. From my experience, a bigger question would be about a correct exposure and color balance when it comes down to actually seeing or dealing with the results. The person asking might be wise to just use a commercial service who can readily satisfy the needs of the customer for what may be a one-time job. Just a suggestion.
Apr 14, 2018 19:59:42 #
Rickyb wrote:
Thanks for the Info. It makes a lot sense for me.
So who are you thanking.......I see you have been around for a few years....... You need to click on quote reply... Or at least use their name.....
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