Exporting Images: What DPI to set or does it matter?
Dear Forum:
I'm using Aperture 2.1.4. To export JPEGs in "Original Size", to retain the highest image quality should hit the "edit" button to make modifications on parameters such as DPI or image quality?
The default setting is 72 DPI. If I change this to 300 DPI, will this improve the retention of detail? As an experiment I exported the same image at 72 DPI (default) and one at 300 DPI. The 300 DPI file was 11mb while the 72 DPI file was only 4 mb. But when I zoomed in on the picture on both I could not notice any difference at all. So therefore, is 72 DPI the most that a JPEG is capable of for a 10.1 MP picture? Are there any other factors on why I should take it up to 300 DPI, perhaps it's easier to post process?
Thanks,
Steve
It really doesn't matter - the number of pixels is the number of pixels the only time it really matters is if the software on the other end uses it to display the image on a device of different DPI and figures out how many "inches" it should be.
This setting can be used in other ways but I am answering the question for your specific question.
RB
Similar Messages
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If exporting images for backup, to reimport into a clean aperture or other program, is it better to use 72 dpi or 300 dpi, or does it matter? I want the best quality for any future unforeseen use.
I am somewhat reluctant to answer your questions after Frank Caggiano's excellent advice, but I really do not like to leave the question open, for there will be many occasions when you will need to export images and to understand how it works.
But please, follow Frank's advice, right now you do not need to worry about pixels and dpi. That is exactly what I meant, when I suggested to you to make sure you keep a copy of your Aperture Library and to back it up with all your other data, before you erase your disk for a clean reinstall.
DPI revisited:
So, is the dpi setting only for exporting to print?
The dpi settings are necessary to define the size of a digital image, since pixels don't have any dimensions. And since you cannot print or display an image without knowing its width and height, you will need to specify dpi when you are printing or scanning.
If I leave it at the default 72dpi will there be any problems getting quality prints in the future from jpeg versions exported with that setting?
Not if you export with the original size - the maximum number of pixels available. That will ensure the maximum print quality.
The dpi settings are required to export versions; versions are derived from the masters and new image files are computed. When you export masters you get a copy of the original file that already may have a dpi setting.
If I choose "export masters", will aperture will export my masters just as they are?
yes, and you may add IPICT data if you choose
Pardon my thick skull--I'm an old dog trying to learn new tricks in this digital world!
No apologies necessary, we were all beginners once
Here is another example, maybe that helps a little:
I exported an image (jpeg) with three different setting: export masters, a version with 72dpi, a version with 300dpi and inspected the files in Graphic Converter:
The master was exported like this:
Notice, the master had already dpi settings, although I did not specify any on export.
The size is 51,48 cm x 38,61 cm.
The 72 dpi Version has larger dimensions, but also 10 Megapixels.
and here the 300 dpi version: smaller dimensions, same amount of pixels. -
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LR has correctly resampled the image but hasn't set the dpi/resolution metadata correctly, it leaves it as 75dpi.In PS, what is the Pixel dimension of the image? if it is very large, then put in 402 and you will see the pixel dimension you want closer to the 6 in by 4 in you want.
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Don Ricklin, MacBook 1.83Ghz Duo 2 Core, Pentax *ist D
http://donricklin.blogspot.com/ -
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I have several hundred stills that that were scanned at 600dpi in jpeg format. I know that 72dpi would be the norm for images in video, but I intend to zoom in at least 200% on many of the stills. So just to be on the safe side, I scanned them all at 600dpi.
In terms of panning and zooming on stills in Premiere Pro, does it matter that the images were scanned as jpegs rather than tiffs or png files? Will that cause problems in Premiere Pro CC for playback or does the image format not matter? If so, would it be wiser to convert all the jpegs to png or tiff files prior to importing into Premiere Pro CC? I understand that they would have to be tiffs or png files to have transparency for compositing purposes. But I only plan to do Ken Burns style moves on the stills, no compositing.
Thanks very much in advance.Hi Ninose11,
ninose11 wrote:
I have several hundred stills that that were scanned at 600dpi in jpeg format. I know that 72dpi would be the norm for images in video, but I intend to zoom in at least 200% on many of the stills. So just to be on the safe side, I scanned them all at 600dpi.
DPI doesn't matter in video, look at the frame size of these images instead.
ninose11 wrote:
In terms of panning and zooming on stills in Premiere Pro, does it matter that the images were scanned as jpegs rather than tiffs or png files?
Yes, JPEG is a lossy compression format. TIFF, PSD, PNG are lossless compression and are a better choice for using for your purposes. However, do a test and see if the JPEGs might look OK so you don't waste time rescanning the images.
ninose11 wrote:
Will that cause problems in Premiere Pro CC for playback or does the image format not matter?
It should not matter much. The thing to be concerned about is the frame size. Using over 4000 pixels in either dimension is going to severely affect your performance. 3840 x 2160 (2x the HD frame size), I found, works well for most all landscaped oriented images. Try it and see if that works for you.
ninose11 wrote:
If so, would it be wiser to convert all the jpegs to png or tiff files prior to importing into Premiere Pro CC? I understand that they would have to be tiffs or png files to have transparency for compositing purposes. But I only plan to do Ken Burns style moves on the stills, no compositing.
Convert? No, that would not help your images performance or quality. Try a test with a JPEGs and see if they work for you. Otherwise, rescan as TIFF, PSD, or PNG and resize the images to 2x the HD frame size.
Hope this post helps guide your decisions.
Thanks,
Kevin -
Revision: 11541
Author: [email protected]
Date: 2009-11-06 14:29:41 -0800 (Fri, 06 Nov 2009)
Log Message:
Fix the textLayout build number that is set in the main build.xml to match what will be set when the build machine does NOT do the build
QE notes: no
Doc notes: no
Bugs: no
Reviewer:
Tests run: checkintests
Is noteworthy for integration: no
Modified Paths:
flex/sdk/trunk/frameworks/air-config.xml
flex/sdk/trunk/frameworks/flex-config.xmlThats good news.
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IPhoto Exporting Quality Size dpi etc. etc. Confused?
Life used to be simple!
JPEG Quality:
If I wanted a photo for view on the web or my computer screen, I wanted a resolution of 72dpi (dots per inch)
If I wanted to it professionally printed, I wanted a resolution of 300dpi, and if I wanted a rough print version for
my home/business printer then I would probably be OK with 150dpi.
Now I can export from iPhoto as JPEG and I am no longer given the resolution options (72 or 150 or 300dpi etc.)
but rather the options for JPEG Quality ARE: Maximimum, High, Medium and Low [unhelpfully referred to as "Smallest size" what else would it be?]
Whatever choice I make appears to make no difference to the visual quality of the picture on screen, but makes a heck of a
difference to the file size AND gives me NO help on what the resolution of the resulting picture is.
0. This would lead me to believe that I should choose Low for ALL web or computer screen uses - as this will result in the
smallest possible file size - which in turn will reduce loading speeds for websites. Is this correct?
Unhelpfully, the iphoto Manual does not explain what these Quality Options mean and therefore I have no idea why or when I should
choose one over another.
1. Can someone out there who really knows their stuff, demystify this for me ?
What do these Quality Options mean, what dpi is assigned to each, and why and when should I coose one over another?
Maximimum
High
Medium
Low
JPEG Size:
This is confusing. If I know that for a particular use I need a particular size photograph (height vs width), I edit it in
iPhoto to the height/width that I need. For example, in the gallery I am using in Rapid Weaver, the designer suggests
a good size for one particular design's revolving banner photos is 980 wide by 656 high - and I am assuming that these are pixel dimensions.
My photos from various sources are inevitably greater than this - and in some cases I might want to re-frame a portrait
photo into a landscape shape. To do this I use the Edit and Crop facility in iPhoto. And I make sure that the photo is edited to
the dimensions I want first.
iPhoto retains the full size photo in it's library, and I can always get it back after cropping if I wish
(by duplicating and reverting to origonal). However once cropped, it helpfully appears to EXPORT the cropped size.
The EXPORT function allows me to chose a JPEG's Size (by which I assume it means pixel width vs height)
2. Can someone tell me the exact effect/meaning of choosing any one of the following - in other words what do these mean or
put another way what pixel size am I choosing for:
Small
Medium
Large
Full Size
3. And am I choosing just the Height size or the Width size and what happens to the other dimension? And how does it
decide? And what are the Heigh or Width sizes allocated to these rather odd choices (Small, Medium, Large, Full Size.)
4. I am assuming that Small must equal a specific Width for a landscape photo, and in that case does it keep the height as it was, or does it constrain the proportions on the basis of the Width it has allocated to Small?
There is a fifth option, but again, it is unclear as to what exactly it does, and I would like help here too! (Sorry, but this is driving me demented!)
Custom
Within Custom, I have three choices:
Width
Height
Dimensions
5. What happens to the Height if I define the Width option? Or similiarly, what happens to the Width if I define the Height option?
6. What on earth does Dimensions mean when it only gives me one dimension to define?
Will it try and make a portrait picture square for example? Is it editing here?
Sorry this is so long, but I would really like to NAIL this - and I suspect I am not the only one!
All I am trying to do is to create the optimized output for the purpose I intend to use a picture for - really simple - or is it?
Thanks to anyone who can have a go at this..... MichaelOK I've got it! - Thanks a thousand - and for anyone who wants a Quick Summary, here it is:
1. Cropping a photo in iPhoto sets the Aspect Ratio
Despite what it appears to do, cropping a photo in iPhoto does not affect the photos’s height or width. It does affect it’s Aspect Ratio - or shape (for example 6 x 4 ), and what is visible within that shape - but not the width or height. Note the absence of inches or cm or meters there. It also affects the content of the picture - or rather which area of the picture is visible (which is the ‘cropped’ area).
So it is OK to Crop the photo in iPhoto, but this should not be confused with the idea that you are cutting the photo into a specific dimension (width or height) - to do that you need the Export facility in iPhoto where you choose a JPEGs Size.
2. JPEG Size
Once the Aspect Ratio is determined (the shape) of the visible area of the picture - the Custom Size Option in the Export Facility can be used to select either the Width or the Height. Obviously if you chose the width, then that measurement will pre-determine the height as iPhoto will calculate the height needed to retain the Aspect Ratio you have set when you cropped it.
If you don’t crop, it will calculate based on the initial Aspect Ratio (shape) of the original photo.
Full Size is exactly that: the image at the dimensions imported from the camera. The others allow you to scale the image. Each reduces the size by about 33% or thereabouts.
Full Size = 100% of the Imported from the camera Dimensions
Large = 66% of the imported Dimensions
Medium = 44% of the imported Dimensions
Small = 29% of the imported Dimensions
As a rule of thumb a 3000 x 2000 (approx) image will reduce to 640 x 480 with the Medium setting
Thumbnails can be generated using the Export and then Web Page function, rather than the File Export function.
Otherwise, you can use the Custom setting to specify an Exact width or an Exact height (and of course the Aspect Ratio will determine the other dimension NOT specified.)
3. JPEG Quality
JPEG Quality is setting the compression of the file which will affect the file size (not the picture Dimensions or the Aspect Ratio), but it will also affect the Quality of the visual image. So here you are seeking to minimise the file size while not losing acceptable visual quality.
Which you choose depends on what you're using the image for... Web site? Start at Low and work from there, if the quality is poor or visually unacceptable, choose a higher quality.
If you are Archiving go for max. The rest - trial and error...
4. For a deeper understanding of these issues
1. Read the thread below AND/OR
2. Take a look at this: The Myth of DPI. AND
3. This: https://discussions.apple.com/docs/DOC-4921
Clarity Rules! - And many many thanks to Terence Devlin for the lesson...
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