Export JPEG size

Hi, can someone explain the following.
I've just exported some photos for printing in Lightroom and set the size to 100% and the JPEG quality to 100%. On one photo the export size is 10.1Mb when I then open file and resave it, still keeping the image size the same & re-saving at 100% JPEG quality the filesize drops to about 4Mb.
I've used Pixelmator to resave the file. Any ideas why this would be? Why does LR save such a large file - does it use a different algorithm?
Cheers for the replies,
Matt

There are lots of ways to compress jpegs. The 100% setting in your other app likely has no real relation to 100% in Lightroom. The app might be subsampling the chroma channels as lots of jpeg libraries do. Also, you are resaving a jpeg, which because of the way jpeg compression works, always leads to generational losses in quality. This usually goes hand in hand with loss in filesize. Lastly, there rarely is any advance in perceived quality going from 90% to 100% in Lightroom.

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IPhoto '11: Export (JPEG) size not working

I keep all my photos taken with iPhone 4 in iPhoto '11 ver 9.42 (710.42).
It is a very excellent app to mange my photos.
Recently I need some photos from iPhoto for the use in my web project.
So I export them in JPEG, choosing "high" quality and "large" size.
Yet, some of the exported JPEG are still in the original size of 2592 x 1936.
I have tried other size options, but those (same) JPEG are always in the original size.
What happened?
I appreciate if gurus here could help me.
Thank you very much.

If the pref file was damaged your test library would have exhibited problems also. Try the following:
Using iPhoto Library Manager to Rebuild Your iPhoto Library
Download iPhoto Library Manager and launch.
Click on the Add Library button,
navigate to your Home/Pictures folder and select your iPhoto Library folder.
Now that the library is listed in the left hand pane of iPLM, click on your library and go to the Library ➙ Rebuild Library menu option
In the next window name the new library and select the location you want it to be placed.
Click on the Create button.
Note: This creates a new library based on the LIbraryData.xml file in the library and will recover Events, Albums, keywords, titles and comments. However, books, calendars, cards and slideshows will be lost.
Note: your current library will be left untouched for further attempts at a fix if so desired.
Also there's a new update for iPhoto, 9.4.3. Wouldn't hurt to update to that version.

Exported Jpeg size

Just started using aperture 1.5 and find that its not bad. I am trying to retouch Raw D200 images to black and white by making a new version and either using the chanel mixer to monochrome or by desaturating. I am finding it really nice to use and comparing the images side by side is fantastic for keeping consistency. Only minor thing i have noticed is the jpeg size is only2.8ish meg when exported from aperture, as apposed to a file that was exported using Nikon picture project or Capture NX and retouched to Black and White in Photoshop which ends up at around 3.8-4.5meg as a jpeg.
Does anyone know why, and is it something to be concerned about?
Thanks for your help.
ANt

<...>. Only minor thing i have noticed is the
jpeg size is only2.8ish meg when exported from
aperture, as apposed to a file that was exported
using Nikon picture project or Capture NX and
retouched to Black and White in Photoshop which ends
up at around 3.8-4.5meg as a jpeg.
Does anyone know why, and is it something to be
concerned about?
The JPEG size is a function of JPEG quality - it could be that NX is set to output lossles JPG, or at least a higher quality level.
For any export preset, you can edit it and adjust the JPG quality - if you highlight an export preset while in the preset editing mode, and hit the "+" button at the bottom left, if will duplicate that preset so you can make a slightly different one.
You probably should look over the presets you use anyway just to make sure all settings are as you would wish.

Exporting full size Jpegs from DNG converted files

Hi there
I imported some RAW files into Lightroom 4, which I then copied/converted to DNG, then edited them. I now want to export them as full size, high-quality jpegs but I only seem to be able to export them at a maximum of about 800kb, which is far lower than full-size. Is this to do with first the conversion to DNG from RAW on the import? Am I best copying them from raw and not converting them to DNG at all? Next question is, will I have to import the original RAWs again and re-edit them to be able to export as full-size high quality jpegs or is there some way to not have to do them again? Many thanks, Sophie

The curious thing is that when I try to export full size jpegs through the email function,
Do you mean exporting through the e-mail the EXACT SAME photos that you were discussing above?
Have you done any cropping of the photos? What is the size, in pixels, of one of these photos according to Lightroom? What is the size, in pixels, of the corresponding exported photo, according to your operating system?
Can you show us screen captures of the export dialog box?
At this time, I am not going to deal with the print at A4 size being pixelated, as printing introduces a lot of other places where something can go wrong. To see if the problem is in the export, I want to know if you look at the exported photo outside of Lightroom, does it appear pixelated or not?

Aperture Exporting JPEG's from RAW: file size and quality questions?

Hey Everyone,
So, I'm using Aperture 2 and I've got some questions about exporting from RAW to JPEG. I shoot with a Nikon D70 so original RAW files are 5-6mb in size. After doing some basic post processing when I export the pics at "full size" with picture quality of 11 out of 12 then the resulting JPEG is about half the file size of the original RAW file. For example a 5.6mb RAW becomes a 2.6mb JPEG. The resolution in pixels per inch and and the overall image size remain unchanged. Have I lost picture quality due to the exporting JPEG being smaller in file size?
My friend who works with me prefers to edit in Photoshop and when he follows the same workflow his saved JPEG from the identical RAW file in Photoshop is minimally smaller in file size, say 5.6mb to 5.3mb. He's telling me that my Aperture edited photos are losing quality and resolution.
Is he right, are my pics of lesser quality due to being a smaller file size? I've always been told that the quality of a picture is not in the mbs, but the pixel density.
I've bee told that Aperture has a better compression engine and that the resulting files are of the exact same quality because the PPI and image size are the same. Is that what explains the much smaller file sizes in Aperture?
I tried changing the picture quality in the export menu to 12 out of 12, but the resulting JPEG then becomes larger than the original RAW at over 7mbs.
Can someone please help me understand this better? I don't want to lose picture quality if that is indeed what is happening.
Thanks in advance for your help.

mscriv wrote:
So, I'm using Aperture 2 and I've got some questions about exporting from RAW to JPEG. I shoot with a Nikon D70 so original RAW files are 5-6mb in size. After doing some basic post processing when I export the pics at "full size" with picture quality of 11 out of 12 then the resulting JPEG is about half the file size of the original RAW file. For example a 5.6mb RAW becomes a 2.6mb JPEG. The resolution in pixels per inch and and the overall image size remain unchanged. Have I lost picture quality due to the exporting JPEG being smaller in file size?
JPEG is a "lossy" file compression algorithm. Whether Aperture or PS, *every time a JPEG is saved some loss occurs*, albeit minimal at the 11 or 12 level of save, huge losses at low save levels. Some images (sky, straight diagonal lines, etc.) are more vulnerable to showing visible jpeg artifacts.
My friend who works with me prefers to edit in Photoshop and when he follows the same workflow his saved JPEG from the identical RAW file in Photoshop is minimally smaller in file size, say 5.6mb to 5.3mb. He's telling me that my Aperture edited photos are losing quality and resolution.
*Both of you are losing image data when you save to jpeg.* IMO the differences between the apps is probably just how the apps work rather than actually losing significantly more data. The real image data loss is in using JPEG at all!
Is he right, are my pics of lesser quality due to being a smaller file size?
I doubt it.
I've always been told that the quality of a picture is not in the mbs, but the pixel density.
The issue here is not how many pixels (because you are not varying that) but how much data each pixel contains. In this case once you avoid lossy JPEG the quality mostly has to do with different RAW conversion algorithms. Apple and Adobe both guess what Nikon is up to with the proprietary RAW NEF files and the results are different from ACR to Apple to Nikon. For my D2x pix I like Nikon's conversions the best (but Nikon software is hard to use), Aperture second and Adobe ACR (what Photoshop/Bridge uses) third. I 98% use Aperture.
I tried changing the picture quality in the export menu to 12 out of 12, but the resulting JPEG then becomes larger than the original RAW at over 7mbs. Can someone please help me understand this better? I don't want to lose picture quality if that is indeed what is happening.
JPEG is a useful format but lossy. Only use it as a _last step_ when you must save files size for some reason and are willing to accept the by-definition loss of image data to obtain smaller files (such as for web work or other on-screen viewing). Otherwise (especially for printing) save as TIFF or PSD which are non-lossy file types, but larger.
As to the Aperture vs. ACR argument, RAW-convert the same original both ways, save as TIFF and see if your eyes/brain significantly prefer one over the other. Nikon, Canon etc. keep proprietary original image capture data algorithms secret and each individual camera's RAW conversion is different.
HTH
-Allen

JPEG export version size?

When working with images shot as jpeg why are the exported jpeg version sizes different than the original image sizes? I've put my image export preset at the highest image quality(12). So shouldn't that mean that the exported version of an unchanged (no adjustments made) image should be exactly the same size as the camera originally captured it? If someone can explain to me how version sizing works I'd greatly appreciate it.
Mac Pro 2 Duo Core Intel Xeon Mac OS X (10.4.8)
Intel P4 3.0ghz Windows XP

Jpeg uses a compress method that depending on the quality chosen converts similar adjacent colors to one. These groups of colors are compressed in squares, and can be easily seen when the quality of the jpeg is very low.
Every time you open and save a jpeg file in Photoshop or other editing software the compression algorithm will compress it a little bit more at the same quality settings, so even at the highest you'll be loosing some information on the image.
When for example you open a jpeg file and edit it to get more detail in shadows the new saved file could be bigger in size than the previous one at the same quality settings because the algorithm find fewer similar color groups.

Aperture won't export full-size jpegs

I'm trying to export full-size jpegs, but Aperture is sending out 24 KB images. I'm selecting the edited versions I want, then going File>Export>Version. I have the dialog set to JPEG - Original Size. Still, what comes out is a thumbnail.
Aperture 3.4.5
OSX 10.8.5
MacBook Pro
2.4 GHz Intel Core 2 Duo
4 GB Memory

Check, if your export preset "JPEG - Original size" is still set correctly.
In the "Export" panel set the "Export Preset" pop-up to "Edit".
In the "Edit" panel make sure, that "Size to" is set to "Original Size", and the quality to a high value, at least 10.

Exporting smaller size JPEGs

In managing a library of thousands of scans of LP record covers I typically save one very large .psd file. I save a 2nd cropped reduced .jpg for use in FileMaker and iTunes and possible web use.
Now with Aperture I don't need to save an additional copy of the smaller file. But a resaved JPEG from GraphicConverter at 300x300 is approx. 45k. The same cropped version exported from Aperture is about 245k. I'm wondering if this is because GConverter allows me to save without a resource fork. Or is it all because of the quality of the preview chosen in Preferences?
Does exporting for email reduce a file size more than a version export?

The curious thing is that when I try to export full size jpegs through the email function,
Do you mean exporting through the e-mail the EXACT SAME photos that you were discussing above?
Have you done any cropping of the photos? What is the size, in pixels, of one of these photos according to Lightroom? What is the size, in pixels, of the corresponding exported photo, according to your operating system?
Can you show us screen captures of the export dialog box?
At this time, I am not going to deal with the print at A4 size being pixelated, as printing introduces a lot of other places where something can go wrong. To see if the problem is in the export, I want to know if you look at the exported photo outside of Lightroom, does it appear pixelated or not?

Exporting Jpegs from Lightroom - DPI question

When I export Jpegs from Lightroom, I set the dpi to 300 pixels per inch. I do not specify a max width or height. When I view these files in Adobe Bridge (CS2 or CS3) the file info says 300dpi. However, when I open the files in Photoshop and select image size, It says 72dpi and has the document size set to very large. I realize that I can enter 300 dpi and uncheck the resample box, I am just confused as to why this is happening.
My concern is, that I upload my images directly to my lab after exporting from Lightroom. Will this cause problems?
Thanks in advance!
David

the image resolution is a combination of the two parameters you mention: size and dpi. a very large size at 72 dpi is equivalent to a small size (like 3x5) at very high dpi. for printing you want at least 240 dpi at the largest size that allows you to keep that resolution. for screen presentations or your web site you want jut 72 dpi. 72 dpi and 2x3 inches will require a very small file size.
I suggest you to export images at TIFF and not JPEG as that will allow you to preserve the image quality when doing editing in PS.
In my case I export TIFF for PS (when I need PS editing) and 72 dpi JPEG for my web site (that way if somebody downloads my image illegally thy get a poor resolution copy). But since LR works very well for me 90% of the images re just kept in raw mode and I print from LR.

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..... Michael

OK 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...

Exported JPEGs Distorted in Shadow Areas

I own a Nikon D7000 and I shoot 14bit RAW.
In Lightroom 3.3 the preview images were distorted, only in development mode the images were fine. I reported to Adobe on this and they seem to have fixed this issue.
In Lightroom 3.3 -- and still in 3.4 -- the exported JPEGs are distorted when the exported image is resized:
A lighter version of the same crop (for illustrative reasons):
As you can see, the gradient has serious artefacts, especially when going from green to black. It is a 90% JPEG quality exported of 1050px width. I have seen this for different image qualities (80-100%), though. This does not occur when the image is exported full size.
Can anybody confirm this?
It seems that this only happens for dark shadows.
I had a Canon G9 that I used with Lightroom and I have never seen a behaviour like this. Right now the export is useless to me.

I've had some discussions about this with Adobe folks during the LR 3 beta phase, but that is all behind a wall now. I think they did put in the dithering into Lightroom now. I still think it is your monitor profile. Also realize that the displays in laptops including the MacBook Pros are not actually full 8-bit displays and you will always see some banding in them. See for example this page: http://www.lagom.nl/lcd-test/gradient.php My guess is that that will show banding on your machine in the shadow areas. Also another issue is that you have to look at these displays at precisely the right angle because you will get raised shadows by quite a bit if you look at them just a few degrees off. One thing to do is to use a test image ( I use monitor_test_txt22.png from this page: http://www.normankoren.com/makingfineprints1A.html ). When you squint the image should be uniform. If not slant the display until it looks uniform.

Export original size not original size

The native RAW resolution of my camera is 6016x4016. When I try to export jpegs as original size, they come out 1798x1200. If I export as TIFF, they come out full size (but 20x as large a file as jpeg.) If I export at 50%, they come out 50%. This is only happening on my iMac, not my MacBook Pro. How do I get aperture to let me export a full size jpeg again?

Open the Image Export Preset and make sure that the settings for the Image Export Preset that you are using match the description.
If that's not it, post back.

Imported pictures are HUGE. Way too big. How do I reduce JPEG size?

JPEG size imports WAY TOO BIG. How do I reduce JPEG size? Thanks so much@!!

Set your camera to take lower quality pictures is the obvious answer here. You can reduce the size of image already in iPhoto when exporting them.

Exporting JPEGs out of Lightroom3 to be projected on a screen

I export JPEG files via a Lightroom 3 preset to an email attachment and then to be projected on a screen.
The color space setting I use is sRBG. Is this setting the same as sRBGIEC61966-2.1 used in CS5? When projected, my images are soft while they are tack sharp in Lightroom 3 or CS5. A fellow member of my camer club thought that the export setting could be the problem and that he always used sRGBIEC61966-2.1 from Photoshop CS5. Any suggestions to resolve this problem?
rbg

That's the correct color profile for typical computer displays.
If you are using LR's built-in "email" preset for export - then that's your problem. This preset makes for small email attachments, but poor image quality. It deliberately scales your image size down to 640 x 480, which is just 0.3 mega-pixels (same resolution as bad cell-phone cams). It also compresses image quality to only 50%. No wonder they look bad when blown up large!
You should find out what resolution their projector runs at (typical sizes are 800x600, 1024x768, or 1280x1024). Export your pictures at that size or larger, and choose at least 80% quality setting or higher.

Lightroom 4.1 exported JPEG files are not recognized by Apple Preview App

I just started using Lightroom 4.1 Trial version (coming from Aperture). I exported JPEG versions of some images using an ICC profile. On my iMac running Lion 10.7.5 the pictures do not show a thumbnail, the file on the desktop just shows "JPEG". I could not open the file with the Preview App, but I am able to open it with DPP (Canon software)? Also the file shows that it has 0 x 0 dimentions when I click Get Info even though it is about 25 Megs in size?
The message I get is
"The file “Edit-739820120223Canon EOS 7D.jpg” could not be opened.
It may be damaged or use a file format that Preview doesn’t recognize."
Does anyone know why this is hapening?
Is it a know issue between Adobe and Apple?
Is there a fix for this?
Thanks for help in advance.

25MB is quite a large filesize for a JPG, and this might be either quite a lot of pixels saved at a very "high" quality (not very much compressed), or it may be an extremely large number of pixels saved with medium compression.
While the technical spec of the JPG format imposes an absolute limit on maximum width and height pixel dimensions, some software employs a lower limit above which it considers the file to be invalid. Different programs, different limits, sometimes.
I have encountered this (for example) with pano stitched images using the full resolution of a large number of component shots - where JPG output could not be made, or if made, could not even be viewed as a whole by my standard image viewer (though TIFF was still OK even at still larger sizes).
If Lightroom has been set to a large printed size AND to a high ppi resolution, it is easy to get into very high numbers and very large output files. One should IMO at least question the utility and benefit of using very high ratios of upsampling from a standard digital photo - which may happen in some cases as a result of using the same output settings regardless, when spreading the same data across both small and large scales. If the file that was imported into LR really does provide an unusually high number of pixels expressing lots of detail, then that will better deserve such a capacious output file. Otherwise, each part of the file may merely show a very highly detailed representation, of a very blurry nothing-much-in-particular.
If the JPG has exceeded the viewer's size limits, a reported width and height of 0 may represent an error message, in effect - not actual reality.
regards, RP

Export JPEG size

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