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Question about resolution of still pix on Canon PowerShot SD30?
I took a photo with the Canon PowerShot SD30 (after not using it for a while, so I didn't remember much about it) and was surprised that the resolution was only 250 dpi. I was asked for a higher resolution (this would be for Internet display primarily). The manual confused me since it did not express resolution in a dpi number like 300 or 400. (I am used to such numbers used in scanning, whereas for digital cameras it seems to be different.) What's the relationship, if any, between the resolution as expressed in dpi and the image size?
The advanced manual, under "Resolution" settings, gives these choices for still images:
Large= 2592x1944 pixels
Medium 1 = 2048 x 1536
Medium 2 = 1600 x 1200
Small = 640 x 480
I had the camera set for a high-quality compression setting (Superfine--don't know if that has anything to do with it).
1 Answer
- B KLv 77 years agoFavorite Answer
The DPI is not the resolution of a digital image. It's the print output resolution, and it's irrelevant. It's important when scanning (hence your confusion) but it is meaningless in terms of digital photography.
Read this carefully, and you will understand everything: The Myth of DPI http://www.rideau-info.com/photos/mythdpi.html - an excellent article explaining the confusion. It also explains the difference when scanning.
You might also wish to direct the person who asked you for a higher DPI to that site also, because evidently they don't know what they're talking about - not your problem, it's theirs!! Unfortunately I come across this confusion all the time.
The Canon PowerShot SD30 is a 5 Megapixel camera <====== that is the resolution.
The superfine setting is the jpeg compression setting. Superfine adds the least amount of compression (the best quality) - but it has nothing to do with the resolution, but lots of jpeg compression will lower the quality of an image and introduce jpeg artefacts.
So if you set it at "Large" and "Superfine", then a 5 Megapixel image (2592x1944px) is perfectly adequate for use on the internet. What it won't be so good for is very large high quality prints (nothing to do with the DPI setting either) - although you will be surprised how large you can print it without it looking bad.
Read this also: The Megapixel Myth, http://www.kenrockwell.com/tech/mpmyth.htm - another very interesting article.