Photo Resizing

Techno-Geek

Techno-Geek

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Tony
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What size do you guys resize a photo for uploading to the web?

Just getting more and more worried about people using my images now, If they are on Photo bucket and the account needs a password to get on can people still take them?

Tony
 
I generally use 800x600 pixels - its seems large enough to be seem and small enough to fit on a page. It depends what you are uploading it too. Forums generally only accept a maximum of 800x600 pixels.
 
Are we allowed to discuss photography in OOF ???, Marcel will be along to tell us off :bat:
 
Ohh right, thanks guys

Marcel, Sorry if this is in the wrong section :thumbs: Please move it if needs be :)

Tony
 
Just want to tag onto this question. I have always thought 800 on the longest side - what about resolution? is 150 ppi too much/too little?
 
photobucket 50%

paint 50, 70, 50
 
CapnKick said:
Just want to tag onto this question. I have always thought 800 on the longest side - what about resolution? is 150 ppi too much/too little?
Click to expand...

800 IS the resolution.

ppi is just a value for software to calculate the default size the image will be when printed on paper.

800 pixels @ 150ppi means it would default to 5.333 inches.

Changing the ppi value has NO effect on the quality of the image.
 
pxl8 said:
800 IS the resolution.

ppi is just a value for software to calculate the default size the image will be when printed on paper.

800 pixels @ 150ppi means it would default to 5.333 inches.

Changing the ppi value has NO effect on the quality of the image.
Click to expand...

So if you have pixel dimensions of, say, 800x500, can't you adjust the "resolution" to affect the print size? And if you vary the pixel dimensions, what will it change on screen - the size or the perceived quality?

Sorry, I guess i'm just a little confused. Thanks.
 
Resolution is the number of pixels, if you change that you change the number of pixels.

Changing the number of pixels will change the size on screen and the actual quality - fewer pixels = lower quality due to less space for details.

ppi is pretty much dead and useless apart from gauging the rough quality you'll get from a print at a given size. Say you've got a 2700x1800px image and print it 9x6" = that's 300ppi which is considered a high quality print.

If you then printed it at 30x20" then ppi would drop to 90ppi which is considered fairly low quality for a print. However the viewing distance for a 30x20" print is such that it would still be acceptable for most people.

The other place where ppi matters is re-sizing an image in Photoshop, etc. Often there's a box for ppi and if the change the value the image will be re-sized accordingly. So If you took your 2700x1800px image and re-sized it to 30x20" @ 300ppi the program would scale the image to 9000x6000px. You wouldn't have any increase in quality as a result because all you've done is stretch the existing pixel information to fit the new size.

There's also an option to turn off re-sampling of the image, if that's ticked then instead of changing the pixel size the "print" size will be changed instead so your 2700x1800px image started off at 300ppi, a print size of 9x6". If you disable re-sampling and set the ppi to 150 then the new print size would be 18x12" but again it would have no impact on the quality of the image.

Changing ppi doesn't change image quality - it's just a number to work out a size in inches for printing. You've got this many pixels times ppi = the size of the print. Drop the ppi and you can still say "print this many pixels at this size".
 
For landscape composed shots, I resize them to 800px x 530px. 800x600 is fine, but I found that it was a tad long on the height side of things, 530px seemed much better for me.

As for portrait composed shots, I'd have to double check, but i'm sure it's something like 630px x 437px.
 
Good input. pxl8, thanks for the clarification. This is a subject that I seem to forget every year or so, and your refresher is just what I needed.
 
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