received photos but unsure regarding file size, can you help

downs523

downs523

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Chris
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I had a family photoshoot recently and have received the photos which i really like but i have noticed that the file sizes on most of them fall under 1 MB. i have been advised that they are done to the following:

cropped to 15x12 inches @ 300 ppi

is this right? if so what size photo can i print to retain quality, say i want to buy some canvas prints A2,A1 size etc??
 
The answer is in the question......

Not entirely sure why they were cropped so heavily, could be because you get distortion when zooming out on images on the average desktop PC (thus you might complain), could be so that you have to go back and pay to get any large prints you require.
 
300 DPI will be fine for Canvas, but not entirely sure why you would receive such being cropped that bad?! Can they not provide larger versions at all?
 
Flightphoto said:
300 DPI will be fine for Canvas, but not entirely sure why you would receive such being cropped that bad?! Can they not provide larger versions at all?
Click to expand...

thanks for the reply, they were baby photos mainly. What size prints do you think will be acceptable to retain good detail? i have asked for larger ones and awaiting the reply
 
To be honest Chris, if I was to sell you a set of photos that I did in the studio, you would receive them in the resolution that my camera exported them as. Companies like 'Venture' will sell you small cropped photos to prevent you from doing your own prints and this is always a thing to watch out for. I would call them and ask for the original batch (after any editing etc) as you would like to use them for your desktop wallpaper, don't give them the clue that you will be printing them, You'll find that most pro printers print 1440DPI for Gloss and 300 for canvas as the weave doesn't allow the detail (I have a 60'' printer and this is what I do as a side line)
I ask all clients to send me photos that are 8MP as a usual minimum and will edit any that need to be sharpened and toned and then will adjust my workflow on the size of the expected print - i.e. some just open an image, print it straight to the printer, while some (me) will actually edit the image on an actual size and then export to the printer as it will come out sharper and clearer (black and white is often the most awkward).

Hope that helps buddy!
 
There is something wrong here,

if an image is cropped to 15" x 12" that's 4500px X 3600px = 46.3mp

The file size on disk would be about 5.5MB where as you are saying the file size is under 1 MB?

Check all this again and if it's correct get back to your photographer for an explanation.
 
below are a few i have checked

9144x11430 5.9MB (thats ok)
3600x4500 1.3MB
3600x4500 992KB
4500x3600 584KB
3600x4500 560KB
3600x4500 948KB
 
Flightphoto said:
To be honest Chris, if I was to sell you a set of photos that I did in the studio, you would receive them in the resolution that my camera exported them as. Companies like 'Venture' will sell you small cropped photos to prevent you from doing your own prints and this is always a thing to watch out for. I would call them and ask for the original batch (after any editing etc) as you would like to use them for your desktop wallpaper, don't give them the clue that you will be printing them, You'll find that most pro printers print 1440DPI for Gloss and 300 for canvas as the weave doesn't allow the detail (I have a 60'' printer and this is what I do as a side line)
I ask all clients to send me photos that are 8MP as a usual minimum and will edit any that need to be sharpened and toned and then will adjust my workflow on the size of the expected print - i.e. some just open an image, print it straight to the printer, while some (me) will actually edit the image on an actual size and then export to the printer as it will come out sharper and clearer (black and white is often the most awkward).

Hope that helps buddy!
Click to expand...

Exactly this :thumbs:
 
downs523 said:
below are a few i have checked

9144x11430 5.9MB (thats ok)
3600x4500 1.3MB
3600x4500 992KB
4500x3600 584KB
3600x4500 560KB
3600x4500 948KB
Click to expand...

I'm guessing all of these except the first one have been saved at 72dpi ?
 
downs523 said:
below are a few i have checked

9144x11430 5.9MB (thats ok)
3600x4500 1.3MB
3600x4500 992KB
4500x3600 584KB
3600x4500 560KB
3600x4500 948KB
Click to expand...

With the exception of the 100 Mpix monster :thinking: :shrug: I would guess that they have been saved at medium/low quality, 50% or so. I have no idea why that first photo is so massive, they must have upscaled it for some reason, but the file sizes for the others indicate low quality JPG output.
 
That's what I was thinking, they've compressed the images possibly for email use?
 
admirable said:
There is something wrong here,

if an image is cropped to 15" x 12" that's 4500px X 3600px = 46.3mp

The file size on disk would be about 5.5MB where as you are saying the file size is under 1 MB?

Check all this again and if it's correct get back to your photographer for an explanation.
Click to expand...

Right idea - wrong maths. It works out to be 16.2MP - so depending on the camera used during the shoot the PIXEL count might not be down too much on the native size.

If the resulting files are less than 1Mb then they must have been save at a pretty low JPEG quality level and I'd be more worried about the resulting artefacts coming into play rather than the actual resolution.
 
Krisstiffer said:
Right idea - wrong maths. It works out to be 16.2MP
Click to expand...

What I should have said is,

If you crop an image in PS to 15" x 12" @ 300ppi it shows in PS as 46.3M
 
Camera used was a 5D mkII
 
Damn, ask for the originals immediately, you don't want compressed JPEG's at all :)
 
Don't forget the composition of the image will also affect file size on a jpeg - are they all shot mainly on a uniform white background for example? are there large areas of consistent colour (and I mean really consistent colour! probably black or white)?
 
Furtim said:
Difference between 8 bit and 24 bit colour depth perhaps?
Click to expand...

Got it in one!!

Photoshop's "image size" takes into account the number of bits per pixel and gives a count in Bytes. Bit confusing because all the help info only refers to the images dimensions in pixels........
 
admirable said:
I'm guessing all of these except the first one have been saved at 72dpi ?
Click to expand...

3600x4500 at 72 dpi is the same size image as it is at 300 dpi or 600 dpi (try it) :).
 
And I was being lazy with my original 16.2MP calculation by using dividing by 1,000 twice rather than 1,024. Being precise it's (4500 x 3600)/(1024 x 1024) = 15.45MP. Multiply by 3 (24 bits per pixel = 3 bytes) and we get the 46.3M given by Photoshop.........
 
It does, try it :)
 
Depends what was agreed when agreeing to purchase. What did the supplier state they would be providing for you ?
 
admirable said:
It does, try it :)
Click to expand...

Nope - Try it and see.
Pixel dimensions are image size (and therefore the biggest contributor to filesize).

dpi / ppi are output resolutions, they're completely arbitrary. If you print tat image sized at those dimensions, the 72ppi one will be massive and pixelated, the 300ppi one will be large and smooth.

NB they only 'contribute' in a lossy file format. Try a std bitmap format (where you can't alter the compression) and you can hang your hat on the figures.;)
 
Agree with Phil, it appears that the thread has gone down the print resolution and not the resolution of the OP's actual photos?
Which is why I suggested to the OP that he requests said images in full res so he can obtain a decent print quality at 300 for fabric and 1440 for Gloss (Also depends on said size of frame as I notch it down depending on the size otherwise you'll have interpolated pixels added)
 
Flightphoto said:
Agree with Phil, it appears that the thread has gone down the print resolution and not the resolution of the OP's actual photos?
...
Click to expand...
Apologies for helping it off topic.

Agree with this: What was agreed? Can you get the replacement files?
 
Tugster said:
Depends what was agreed when agreeing to purchase. What did the supplier state they would be providing for you ?
Click to expand...


^^^ This.

Before anyone starts to criticise the photographer - best to get the facts about what was agreed to be delivered, and what purpose those files were sold for.

If the OP didn't pay for hi-res/high-quality files then no-one should be jumping down the photographers throat.
 
Sorry Phil, I meant I agreed with your statement regarding DPI & PPI!
 
I think someone is getting confused here,

If you take an image and crop it in PS to 15x12 @300 it is going to be a larger file size than if you had cropped it at 72.

or am I missing something?
 
admirable said:
I think someone is getting confused here,

If you take an image and crop it in PS to 15x12 @300 it is going to be a larger file size than if you had cropped it at 72.

or am I missing something?
Click to expand...

You're missing something - we're talking about 2 files both with the same pixel dimensions. As per your earlier post...

admirable said:
There is something wrong here,

if an image is cropped to 15" x 12" that's 4500px X 3600px = 46.3mp

...
Click to expand...
15x12 at 300ppi and 15x12 at 72 ppi are indeed different file sizes.

but 4500px X 3600px at 300ppi and 4500px X 3600px at 72 ppi are exactly the same file size.
 
Phil V said:
15x12 at 300ppi and 15x12 at 72 ppi are indeed different file sizes.

but 4500px X 3600px at 300ppi and 4500px X 3600px at 72 ppi are exactly the same file size.
Click to expand...

I agree with this, I think you've picked me up wrong or I've not explained myself
 
admirable said:
I agree with this, I think you've picked me up wrong or I've not explained myself
Click to expand...

I think it's because you used the pixel and print dimensions in the 1st post. Glad it's all sorted.
 
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