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Tuesday, 4 December 2012

dpi vs. megapixels???



I am TRYING to figure this out, and cannot Google anything effective that I can understand. I'm looking at a photo converter and a negative/slide scanner/converter and trying to decide/figure out:

#1-if it would be better to get them separately, because the negative converter I've found in a catalog says it will convert to 9 megapixel resolution, the highest I've ever seen advertised (most photo converters say 5 or 5.1, and I've been waiting for years to see if that number goes up and it hasn't)

and 2#-how to freakin' figure out a dpi to megapixel conversion-I found a photo converter on Ebay that says it will "convert photos to a high-resolution 36oo dpi", but I cannot for the LIFE of me find a chart that will translate those numbers into something I can understand. I just want to know something that's so simple, and yet I am obviously missing something because I can't find it! All the charts I've found on various sites make you put in several different things before you can find out the info, and all I have is "36oo dpi", I don't have the width and length dimensions, or whatever the hell else they want. Geezus kryst, nothing gets me frustrated like dealing with this kind of sh!t. For perhaps the first time ever, I'm actually jealous of the very young because everything they've ever known is digital, and they don't have to deal with this headache of trying to immortalize all their photos-it's already done all over their Facebooks and whatever other sites they upload to.


Canon CanoScan 9000F MKII Color Image Scanner

Canon CanoScan 9000F MKII Color Image Scanner

A1
Can't you just multiply the dimensions of the negative by the scanner dpis and get the megapixels?

When it comes to scanners, the driver and software contribute significantly to the usability. In flatbed scanners, Epson and Canon are very good; HP might be tolerable if you only want to scan office documents. Sometimes refurbished models are available at a significant saving; I got the Epson Perfection V500 for about 1/2 price that way. It comes with adapters for slides and negatives.

Check the reviews at Amazon and BHPhotovideo. From a cursory glance, it looks like the cheaper models just use a basic digital camera to take a snapshot, so the resolution is limited. Maybe that's perfectly OK for snapshots made with 35mm disposables and point-and-shoots. I'd lean towards something like the Plustek scanners since 3600 dpi is a MUCH larger number of megapixels.

A2
Sorry for the late reply, thank you for helping...I ended up getting a scanner that has software and ability to also scan negatives...that part hasn't worked out very well so far, but I've really liked how well the scans of actual pictures have come out! I settled on a Canon-A CanoScan 9000F, to be exact:

http://www.amazon.com/Canon-CanoScan-9000F-MKII-Scanner/dp/B00AGV7TQG/?_encoding=UTF8&camp=1789&creative=9325&linkCode=ur2&tag=commercialrea-20&linkId=POMA7CXIBGZPPSWE

Never did figure out DPIs and pixels and that *beep* but I'm fairly happy with this-IF I can get the 35mm negs to scan right!

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