resolution ???

Mike Hide wrote:

Some dumb questions …. are pixels and dpi one of the same ?

No. Pixels are the small building blocks of a digital image. DPI stands for ‘dots per inch’ but is also often used for ‘pixels per inch’. It is a measure of the size the pixels will be printed, and consequently the size the whole image will be printed. For example: 300dpi means that 300 pixels fit in one inch, so the size of each pixel is 1/300th of an inch.

In terms of digital cameras …. what size print will a 4 meg camera produce at 300 dpi and how is the figure arrived at ?

A 4 Mpixels camera will produce an image of about 2200 x 1800 pixels (this may differ per model). So if you print this at 300 pixels per inch, the size of the print will be 2200/300 x 1800/300 inch, which is approx. 8 x 6 inch.

—
Johan W. Elzenga johan<<at>>johanfoto.nl Editor / Photographer http://www.johanfoto.nl/

Thank you Johan ,so basically the term dpi and pixel per inch are interchangeable when dicussing image sizes .

As far as the image size goes ,do all digital cameras produce images with the same aspect ratio [height to width] as 35 mm does ? thanks again .mjh

—
http://members.tripod.com/mikehide2
"Johan W. Elzenga" wrote in message

Mike Hide wrote:

Some dumb questions …. are pixels and dpi one of the same ?

No. Pixels are the small building blocks of a digital image. DPI stands for ‘dots per inch’ but is also often used for ‘pixels per inch’. It is a measure of the size the pixels will be printed, and consequently the size the whole image will be printed. For example: 300dpi means that 300 pixels fit in one inch, so the size of each pixel is 1/300th of an inch.

In terms of digital cameras …. what size print will a 4 meg camera

produce

at 300 dpi and how is the figure arrived at ?

A 4 Mpixels camera will produce an image of about 2200 x 1800 pixels (this may differ per model). So if you print this at 300 pixels per inch, the size of the print will be 2200/300 x 1800/300 inch, which is approx. 8 x 6 inch.

—
Johan W. Elzenga johan<<at>>johanfoto.nl Editor / Photographer http://www.johanfoto.nl/

"Mike Hide" wrote in message

Thank you Johan ,so basically the term dpi and pixel per inch are interchangeable when dicussing image sizes .

exactly

As far as the image size goes ,do all digital cameras produce images with the same aspect ratio [height to width] as 35 mm does ? thanks again .mjh

they are usually at least very similar – i mainly used olympus and now nikon d100/d70 – the nikons are slightly wider than the olympus format.

Mike Hide wrote:

Thank you Johan ,so basically the term dpi and pixel per inch are interchangeable when dicussing image sizes .

Correct. Officially, the term dpi is reserved for the hardware resolution of the printer. A printer can be 2400 dpi, but because it needs several dots to simulate all the possible colors of one pixel of your image, your image will still be printed at 300 ppi (or even less).

As far as the image size goes ,do all digital cameras produce images with the same aspect ratio [height to width] as 35 mm does ?

No, most digital compact cameras have an aspect ratio of 3:4, while the aspect ratio of a 35mm camera is 2:3. Digital SLR cameras do have an aspect ratio of 2:3 and some digital compacts can be set to 2:3 (which means you cut off some of the image, because the sensor is 3:4).

—
Johan W. Elzenga johan<<at>>johanfoto.nl Editor / Photographer http://www.johanfoto.nl/

Thank you Johan ,so basically the term dpi and pixel per inch are interchangeable when discussing image sizes .

—

Be careful. DPI when talking printer resolution is not the same and this is where the confusion comes in. A dot of ink is much smaller than a pixel and it might take many dots of ink to make a pixel. A printer might have a resolution of 4800 X 1200 dpi. That is dots of ink, not pixels. If everyone would talk dpi for printing and scanning, and ppi for digital images there would be far less confusion.

On Tue, 11 May 2004 13:55:21 GMT, "Mike Hide" wrote:

Some dumb questions …. are pixels and dpi one of the same ?
In terms of digital cameras …. what size print will a 4 meg camera produce at 300 dpi and how is the figure arrived at ?

Have a look at this:

http://www.ransen.com/Articles/MegaPixels/default.htm

for a quick simple explanation.

Unique and easy to use graphics programs
http://www.ransen.com

thank you all for your time and helpful responses….mjh

—
http://members.tripod.com/mikehide2
"O Ransen" wrote in message

On Tue, 11 May 2004 13:55:21 GMT, "Mike Hide" wrote:

Some dumb questions …. are pixels and dpi one of the same ?
In terms of digital cameras …. what size print will a 4 meg camera

produce

at 300 dpi and how is the figure arrived at ?

Have a look at this:

http://www.ransen.com/Articles/MegaPixels/default.htm

for a quick simple explanation.

Unique and easy to use graphics programs
http://www.ransen.com

After loooking at http://www.ransen.com/Articles/MegaPixels/default.htm and in the middle of trying to select a digital camera I think I will keep my film camera ….mjh

—
http://members.tripod.com/mikehide2
"O Ransen" wrote in message

On Tue, 11 May 2004 13:55:21 GMT, "Mike Hide" wrote:

Some dumb questions …. are pixels and dpi one of the same ?
In terms of digital cameras …. what size print will a 4 meg camera

produce

at 300 dpi and how is the figure arrived at ?

Have a look at this:

http://www.ransen.com/Articles/MegaPixels/default.htm

for a quick simple explanation.

Unique and easy to use graphics programs
http://www.ransen.com

On Fri, 14 May 2004 12:53:43 GMT, "Mike Hide" wrote:

After loooking at http://www.ransen.com/Articles/MegaPixels/default.htm and in the middle of trying to select a digital camera I think I will keep my film camera ….mjh

Why?

Unique and easy to use graphics programs
http://www.ransen.com

Why !! well if I want an image that I want to produce a say 8 by 10 print and then want to crop a small section and then blow that up it seems to me i cannot be done with simple digital camera .

If you are interrested in web pages or monitor images fine a simple 4 meg camera will do the trick

Now I am wondering from a print standpoint what kind of digital camera resolution [image pixel size ] is comparable to say 100 asa film…..mjh

—
http://members.tripod.com/mikehide2
"O Ransen" wrote in message

On Fri, 14 May 2004 12:53:43 GMT, "Mike Hide" wrote:

After loooking at http://www.ransen.com/Articles/MegaPixels/default.htm

and

in the middle of trying to select a digital camera I think I will keep my film camera ….mjh

Why?

Unique and easy to use graphics programs
http://www.ransen.com

On Fri, 14 May 2004 17:59:50 GMT, "Mike Hide" scribbled:

If you are interrested in web pages or monitor images fine a simple 4 meg camera will do the trick

If that’s all you’re interested in then a 1 megapixel camera is enough. Oddly the more MPs cameras come with the smaller the maximum print size becomes. When I bought my 2MP camera it said you could get 8×10 prints from it, and you can, now you’re here saying if you want web page images a 4MP camera is enough…. and the manufacturers have move it from 2 to 3 MP for an 8×10, next year when all the cameras are even better it’ll be even higer and I’ll still be getting decent 8x10s out of my 2MP camera.

On Fri, 14 May 2004 17:59:50 GMT, "Mike Hide" wrote:

Why !! well if I want an image that I want to produce a say 8 by 10 print and then want to crop a small section and then blow that up it seems to me i cannot be done with simple digital camera .

Depends on how small the section is and how many pixels resolution the camera has. You’d have problems (of a different nature) with film cameras.

You can’t just blow up film camera photos and expect no
degredation in the resolution. You wold not get pixel artifacts, but you would get different artifacts.

Unique and easy to use graphics programs
http://www.ransen.com