can my Sony T200 shoot images in 300dpi??

[edbell]

i really need to produce some pictures that are high resolution (300t dpi) for a magazine feature on my business.
Is the T200 capable of doing this?
I shoot in 8 mega pixel,
when browsing images on my PC their 72dpi height and 72 dpi width.

help is urgently needed as monday is deadline to get these images to publisher!

cheers in advance

Ed

[Ray Schnoor]

This 72 dpi number you see is irrelevant. You do not really have PPI(pixels per inch) until the image is printed.

With a T200, your 8MP image is ~ 3265 pixels x 2449 pixels.

At 72 ppi, you will print an image of ~ 45" x 34"

At 300 ppi, you will print an image of ~ 11" x 8"

To see what size you can print at a certain pixel density (72ppi, 200ppi, 300ppi...) just divide the pixel width and height by the pixel density.

Ray.

[edbell]

This 72 dpi number you see is irrelevant. You do not really have PPI(pixels per inch) until the image is printed.

With a T200, your 8MP image is ~ 3265 pixels x 2449 pixels.

At 72 ppi, you will print an image of ~ 45" x 34"

At 300 ppi, you will print an image of ~ 11" x 8"

To see what size you can print at a certain pixel density (72ppi, 200ppi, 300ppi...) just divide the pixel width and height by the pixel density.

Ray.

cheers ray for your aded info.
so jus for clarity,

when my publisher is asking for high res, and specifically 300dpi images, how can I be assured that they will be of that quality?what figures in the images properties) should I be looking for?do I need to tweak the iamges with something like photoshop?
As an example, I 've got an image taken in 8m/pixel, with properties of
dimensions 3264 x 2448.

sorry for wat may appear dumbass questions, i'm very new to the field of digi photography!
Ed

[edbell]

Also ray, so when my publisher is askin for images to be 300 dpi, is the dpi actually jus something that is dependant on how big she plans to print the image at?

[Ray Schnoor]

If you really want to, you can go into Photoshop with your image. Under the Image menu select Image Size. When the dialog comes up, make sure that the resample image box is not checked. Now change the resolution value from 72 pixels/inch to 300 pixels/inch. The size of the image(height and width) will change automatically. Now hit OK.

You have done absolutely nothing to the image, just how Photoshop displays the image on the screen and how it will print if you print from Photoshop.

The only other thing that you have done is to degrade the image slightly if you resave as a jpg image.

Any publisher who is asking that you make sure you have 300 dpi images, does not fully understand a digital image.

This, however, is how you can change your 72 dpi images to 300 dpi images, although it will look no different on you computer screen. The exact same data is still in the image.

Ray.

[Beowulff]

This site explains DPI and PPI and their relationship pretty well.

All About Digital Photos (http://www.rideau-info.com/photos/mythdpi.html).

Hope it helps. Cheers :)

[edbell]

If you really want to, you can go into Photoshop with your image. Under the Image menu select Image Size. When the dialog comes up, make sure that the resample image box is not checked. Now change the resolution value from 72 pixels/inch to 300 pixels/inch. The size of the image(height and width) will change automatically. Now hit OK.

You have done absolutely nothing to the image, just how Photoshop displays the image on the screen and how it will print if you print from Photoshop.

The only other thing that you have done is to degrade the image slightly if you resave as a jpg image.

Any publisher who is asking that you make sure you have 300 dpi images, does not fully understand a digital image.


This, however, is how you can change your 72 dpi images to 300 dpi images, although it will look no different on you computer screen. The exact same data is still in the image.

Ray.

Thankya fella.
Shes a publisher slash photocopyer me thinks, but I'm grateful for your help.
the jist of it seems that the dpi is dependant on how big you plan on printing the image. and just make sure you take the images in the highest possible megapixel to be safe on having a decent res for magazine photography.
It looks like with an 8megapixel camera I shouldnt have any problems giving her images of suitable quality for a magazine size image.

I'n not a fan of photoshop so i will jus leave it well alone.
I think shes confused issues abit by askin for it to be 300dpi.

[edbell]

This site explains DPI and PPI and their relationship pretty well.

All About Digital Photos (http://www.rideau-info.com/photos/mythdpi.html).

Hope it helps. Cheers :)


WOW!that website confuses me and explains it in equal measures!I think i'm stick to jus makin sure i'm takin photos in 8 megapixel, and that seems to be enough for an image of magazine size reproduction

cheers beowulf!

[David Metsky]

when my publisher is asking for high res, and specifically 300dpi images, how can I be assured that they will be of that quality?what figures in the images properties) should I be looking for?do I need to tweak the iamges with something like photoshop?
As an example, I 've got an image taken in 8m/pixel, with properties of
dimensions 3264 x 2448.

Just to sum up, your camera takes 3264x2448 images. Those images don't have DPI as a property, they just have pixels. To view the image, PhotoShop must assume a default DPI for display purposes but it doesn't affect the actual image in any way. The DPI only really affects the number PhotoShop displays for size in inches but, again, it doesn't affect the image in any way. It choses 72dpi because it's a standard for on screen use.

When you send the image to your publisher and the set it to print at 300 dpi the resulting image will be 11" x 8". That's because if you take 3264 pixels and display them at 300 dots per inch, it will be 10.88" long.

[edbell]

Just to sum up, your camera takes 3264x2448 images. Those images don't have DPI as a property, they just have pixels. To view the image, PhotoShop must assume a default DPI for display purposes but it doesn't affect the actual image in any way. The DPI only really affects the number PhotoShop displays for size in inches but, again, it doesn't affect the image in any way. It choses 72dpi because it's a standard for on screen use.

When you send the image to your publisher and the set it to print at 300 dpi the resulting image will be 11" x 8". That's because if you take 3264 pixels and display them at 300 dots per inch, it will be 10.88" long.

ahhh so when shes asking for it to be 300dpi, is she really askin for it to be of quality good enough at 11" x 8"? and if so does 8megapixel produce images good at that size?is that what your sayin?i found a website http://www.unlikelymoose.com/more/cameras/megapixel_converter.html which I think is explaining what your gettin at, being that there is a correlation between megapixel and optimum image size?not sure where image QUALITY comes into it however...

[edbell]

ha i know I'm jus respondin to me own posts here but i think i'm addin to the debate!
I guess ANY image taken with pretty much any megapixel number camera can be reproduced/printed at 300dpi?its just that the quality will IMPROVE with the more megapixels used.is that somethin to do wit the larger th megapixel, the larger the image can be reproduced hence the more detail included if the image is scaled down?so that an image taken on a 6megapixel camera reprodced to fit 300dpi will have alot more detail than a image taken on a 2megapixel camera also reproduced at 300dpi?ahh its such a huge amount of info, but its defo interestin

[Ray Schnoor]

ahhh so when shes asking for it to be 300dpi, is she really askin for it to be of quality good enough at 11" x 8"?
No, this is not what she is asking. It is just that your camera(T200 8MP image size = 3264 pixels x 2448 pixels) at 300 pixels/inch will print at ~ 11"(3264/300 = 10.88) x 8"(2448/300 = 8.16).

Does she know what camera you use? If not, how could she possibly know that your camera at 300 pixels/inch would print at 11" x 8"?

Say, instead of your T200, you had a 10MP camera. Your image size would be ~ 3651 pixels x 2738 pixels. At 300 pixels/inch, this image would print at 12"(3651/300 = 12.17) x 9"(2738/300 = 9.13).

I am not really sure what she is asking, and I am positive that she does not know what she is asking. At the least, she is not asking for what she thinks she is asking. Any size image can be printed out at 300 pixels/inch whether it is a 1MP image or a 12MP image. The 12MP image(13.3" x 10") will just print a much larger size than the 1MP image(3.8" x 2.9") at 300 pixels/inch.

Ray.

Edit: On the other hand, if she does in fact know that you are using an 8MP T200 digital camera, then maybe she does want to print an 11" x 8" photo at 300 pixels/inch.

[David Metsky]

which I think is explaining what your gettin at, being that there is a correlation between megapixel and optimum image size?not sure where image QUALITY comes into it however...
Image quality and image size have very little to do with each other. Due to the limitations of physics when you capture more MP on a small sensor the image quality goes down. So, if you move from a 7.2 MP camera to a 10 MP camera with the same sensor size, you'll have a bigger picture but the image quality is likely to go down. It doesn't matter if you can print that image at 11" x 14" at 300 DPI, the actual image itself may be more noisy then the 7.2 MP image that can only be printed at 8" x 10" at 300 DPI.

300 DPI is the standard for printing because that's what works best for the human eye. On a computer screen 72 DPI is all the human eye typically can resolve.

There is no optimal image size. There are DSLRs that take 6 MP images that provide substantially better quality image then your T200 or any 12 MP P&S. That's because their sensors are much bigger, and their images are much cleaner. No, you can't easily print a poster sized image from the shot, but it'll produce a much better quality 8x10 print.

[Visual Reality]

As a note here, the dpi is automatically adjusted to fit your medium. Printing to a 4x6 the system may need 400-500dpi to fit a large image onto the paper. In contrast, it may need 200dpi to fit across an 8x10. The software setting means virtually nothing.

As I understand it, the image size that photo editing programs will show you, is the maximum size of the image that you can print at the current DPI, without having to lower it to fit.

[JTL]

The "publisher" is an idiot. There, I said it! :eek: