Low Resolution........

[Maureen Souza]

Okay...one more question. Why does my 20D have a resolution of only 72 but my PowerShot Pro1 has 180? Is there anyway I can increase the resolution on my 20D and decrease the size of the huge (large-superfine) picture?

Just wondering if such a thing is possible....?:confused:

[tim]

Are you talking pixels per inch? Ignore the inches bit, just look at pixel count. PPI is a software thing, not a camera thing. In photoshop use the resize pic function, but turn off the resample checkbox.

[robertwgross]

I would phrase Tim's comment a little differently. DPI is more of a printing thing, and it has little relevance to anything until print time. Your camera could have plugged in just about any number there, and it won't make any difference until you get ready to print.

---Bob Gross---

[Maureen Souza]

Maybe I should clarify....when I open my pictures in PS and check their size, I notice they are about 34x49 inches with a resolution of only 72. I changed the size which automatically increseases the resolution but I am wondering why the original resolution is so low.... My other cameras have smaller pictures but higher resolutions right out of the camera. The pixels are fine and I know what I am doing with them when I edit to print. I guess I would like the size of the picture to be a bit smaller and gain resolution right in the camera and I think I'm asking too much.

[Motorsports Photo]

The reslotiion isnt low, its just PS' way handling images in a silly way. Your pixel count is still the same, it just decided to display it as 72. You can type in 300 and see a smaller different inch size. I havent found a way for PS to just display images in, say, 300. Sounds like different cameras can do it though.

-Pete

[Bodog]

Maureen, your image resolution is dependent on the image dimensions in pixels, not the DPI (actually PPI, Pixels per inch, not to be confused with printer mfrs claims of DPI, or dots per inch). PPI is merely an imbeded instruction to tell your printer how large to make the pixels. You've already noticed that the larger the pixels, the larger (and coarser) your document (print). :)

[pcasciola]

Size of the picture in Photoshop and dpi is almost completely irrelevant. Just ignore it. Like Robert said, the camera could be putting any random number in there. When it comes down to it, it's pure resolution over print size that determines DPI, the reported size in Photoshop is meaningless. You are not gaining or losing resolution by changing the DPI. A 20D large/fine JPEG is going to be right around 300dpi when printed at 8x10, regardless of what size Photoshop shows you.

[PacAce]

Just wanted to add one little caveat to what was discussed in the above posts. When changing the DPI, make sure that "resampling" is NOT checked. If it is, then image resolution/size WILL change.

[robertwgross]

The reslotiion isnt low, its just PS' way handling images in a silly way. Your pixel count is still the same, it just decided to display it as 72. You can type in 300 and see a smaller different inch size. I havent found a way for PS to just display images in, say, 300. Sounds like different cameras can do it though.


Pete, it is actually the camera that is sticking the 72 DPI number into the file that PhotoShop then reads. Other camera stick a different DPI number into their files. So, it is not PhotoShop that is silly.

---Bob Gross---

[Moments]

For some reason Canon has set the 10D/20D with the 72DPI and the 1DS is at 180DPI if I remember correctly. When you use Canons EOS viewer to export raw files to jpegs or tiffs, you can set the resolution at any that you wish for, say at 300DPI. I don't shoot in JPEG, but you might be able to set the exporting of jpegs to do the same.

Pete
http://www.memorablemoments.net (http://www.memorablemoments.net/)