Hi res and Low res?....

[chloewindle1]

I'm going to start offering clients hi res and low res digital copies of photographs. BUT, I don't know the sizing? The photo's will be used for social media such as facebook. What should I size the hi/low res images in? I use photoshop CS5 and will be using this method of resizing...

 

[runnah]

It's not so much the pixel dimensions but the dpi. 72 for web and 300 for printing.

As far as the dimensions go well I normally adjust that to fit the thing I am putting the image into. 1200x800 is a decent web based size. for low res.

 

[Braineack]

I've found that if you upload higher res photos to FB, they don't get destroyed as bad.

 

[KmH]

It's not so much the pixel dimensions but the dpi. 72 for web and 300 for printing.

As far as the dimensions go well I normally adjust that to fit the thing I am putting the image into. 1200x800 is a decent web based size. for low res.

It's almost entirely the pixel dimensions, because the client can change the PPI to have a print made.

It's ppi, not dpi, and for the web ppi is meaningless. Photoshop is careful to use the correct term - ppi- in the Image Size dialog box and where ever else it is needed.
You could set it to 1 PPI or 10,000 PPI and online the photo stays the same size, because only the pixel dimensions have meaning for electronic display.

Web pages and other applications will usually re-size the image anyway and display resolution determines how large the image appears on the display.

But yes, for low res re-size to smaller pixel dimensions.
When you re-size you also have to consider if/which re-sampling algorithm to use and if you are saving JPEG files what Quality setting to use to control compression and the file size.

File size and image size are 2 different things.

Advanced cropping, resizing, resampling | Photoshop

 

[Gavjenks]

Try to choose the largest size that fits both criteria:
1) Is just small enough that FB won't have to resize it for a typical monitor with their inferior resizing algorithms compared to photoshop
2) Is an even factor of two of the size of the original image if at all possible. I.e. exactly 1/2 the pixels across, 1/4, 1/8, etc. These particular sizes result in the fewest artifacts. But if none of those fit the FB size closely enough, don't sweat it.

 

[Braineack]

this image is hosted on FB: https://scontent-b-dfw.xx.fbcdn.net/hphotos-prn1/t31.0-8/1606226_10101613393214116_470875996_o.jpg

it's 1920px wide. So when you view it at full screen on FB, you see a larger file. But it did drop it down from a filesize of just over 1mb to 300kb; but i save my stuff at 300dpi.

when viewed inline, it links to this: https://scontent-b-dfw.xx.fbcdn.net/hphotos-prn2/t1.0-9/1899896_10101613393214116_470875996_n.jpg

you can see it's been compressed and resized to 960px.