Question about Pentax Optio S40 Digital Camera

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Dpi issues with the s40

I've been taking pics with my s40 for a good month now, and have only now realized that the dpi is only at 72. i can't say that the picture quality has been an issue, in fact that's been of no issue whatsoever, but i'd like to know if it's possible to up the dpi on the camera. P.S. This is my first post although dpreview.com has been my bible since I started researching this camera, and I can't say how useful all of the info on these forums has been.

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DPI in the EXIF data is totally spurious. Are you using a printer which only prints 300 DPI ? Any recent printer is at least double that. You have DOTs per inch, and Pixels per inch. Which are different things. DOTs per inch is a printing term. In offset printing, there are no shades of grey so you use a half-tone screen which produces dots of different sizes. The finest screen is ... 300 DPI. Depsite a lot of people bring "300" into discussions it's pretty meaningless. Inkjet printers don't rely on the same kind of dots, and they go up into 5000 DPI range. Printers print more dots than your picture has pixels. All printers will interpolate the Pixels you give them into the right number of DOTS to fit on the paper. It is very rate that spreading your image over more Pixels in photoshop will do better than the printing hardware. If you really need to interpolate the image out to more pixels look at Qimage (and have a read of http://www.ddisoftware.com/qimage/quality/ too).

Posted on Sep 08, 2005

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Do not be too bummed out. The DPI reported in the EXIF data does not mean all that much. What does matter is the total number of horizontal and vertical pixels in an image and how this relates to the output size. For instance, your camera is capable of producing a 2304 by 1728 pixel image. This works out to about 220 DPI when printing an 8 by 10 inch picture. If you look at this the other way around, image editors will indicate an image size of 32 by 24 inches for an image taken by your camera (2304/72 and 1728/72). It is doubtful you will print at this size. Image software will take advantage of the full resolution when printing an 8 by 10, or 11 by 14.

Posted on Sep 08, 2005

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Unabel to print 72


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How do I take a picture at 300dpi


The DPI are not a user allowed settings. Normally DPIs are factory defined.
You can change the DPI using software. Normally the image administration software and advanced softwares can allow you to change it.

Remember an important issue: DPIs are a printing matter not an image quality matter. Yo can set an image to 300 DPI and the same to 72 DPI and you will see no difference between both images.

A good camera and your skills will allow you to take high quality images.

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Why does the FinePix E510 pictures download from the camera at 72 dpi when the camera was set to take 500 megapixel photos? I cannot find any way to adjust this in the finepix manual or in online help. I...


A couple of things - I don't think you mean 500 megapixels (that is a lot!) but I assume you mean you expected a high resolution image. You may have it! The dpi setting is largely irrelevant (for photographers) as it simply relates number of pixels to a (notional) print size. Thus an image that is 3000 pixels wide (say) would print out to 10 inches at 300 dpi (3000/300) or 40 inches (approx) at 72 dpi (3000/72). the image has the same information /resolution - it's just "spread" further on the larger print. You can easily change the nominal dpi in e.g. Photshop Elements but it won't affect your image quality.
If however you are getting low resolution images when setting the camera differently that's something different. I would need extra info to help there but pssibly check if the camera was set to RAW and maybe you were looking at the (small) JPEG usually saved with it?

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Photo resolution


Sony H1 takes photos at 72 dpi by default. But the picture quality will be good. if you want to convert it to 300dpi open the picture in adobe Photoshop and select image size and change resolution to 300 dpi. but the file size will be very high to up load. if you want to reduce the file size select the image size in adobe photoshop and reduce it according to your requirement. if my solution proves good please rate it. Regards.

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Sounds like Photoshop's setting, or default setting, is to import picture at its maximum size. If you RESIZE pic on Photoshop, it shoud automatically increase DPI while reducing physical size.

The other thing to be aware, TZ3 defaults to a certain jpg compression. You can minimize compression of data with settings options on TZ3, but I doubt this has anything to do with your PhotoShop issue.

Also, in SIMPLE mode you can select a physical size for photo, even after pic is taken(resize), on camera.

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Resolution


Many cameras will take pictures at only 72 dpi. Changing the resolution causes the camera to change the size of the picture in terms of pixel dimension (ie 800x600 vs 640x480) but always at 72 dots per inch. A photo editing program like Photoshop can change the resolution to whatever you need.

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Higher res pics on OPtio S4


This resolution doesn't matter to most software. It doesn't change the image at all, just occasionally the size it is displayed (only if the software scales the image according to the resolution, which most don't). This having been said, I doubt there is a way to change it in camera. But you could certainly change the XResolution and YResolution meta information with any good EXIF editor. Also, Photoshop can do this too, but it will mess up other things in the meta information. You should be able to script either to apply this change to a number of photos at once.

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