Understanding image resolution and appearance across devices

I used CS6 standard.
Why have some images have soft edges under retina (iPad 3) but sharp on a screen (non-retina)?
Does this mean I will have to rework all my images to work with retina display? As most of my images are 72dpi, not sure if this relevant or not?
Can someone kindly advice me the best ideal way to overcome this problem.
Message title was edited by: Brett N

simonart wrote:
Paul, Yes, I can see where you are coming from. You have given me something to think about cropping.
Yeah, the proportions of the iPad3 are a bit off; I usually send out 600x400 pixel images - I find the proportions pleasing - for display on, mostly, social networking sites etc, and while most people up 'til now have considered 1080 vertical to be "HD" (LOL!!!) that's been good enough.
The Retina Display on both the iPad and MacBook Pro, is something of a game-changer image quality wise; we're now hearing rumors of an iMac with a Retinal Display! While that's still in fanboy nerdgasm territory - I've not seen any leaks out of the Apple supply chain about them having been sent sample displays - I think it really is just a matter of when, not if.
Mind you, I for one will be happy if these new HiDef displays dissuade people from posting their scuzzy fonecam pics all over the web (LOL!) as c.pfaffenbichler indicated above, pixels is pixels!!!

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Iatrogenic huh! Cool!
Anyway, I'm not real clear on what it is you are trying to accomplish. Despite your obvious vocabulary skills, there seems to be some disconnect relative to what you are trying to accomplish. You are right that "exporting a version" in Aperture is roughly equivalent to what happens in ACR when you "Open" a RAW image into Photoshop. In both cases you have, hopefully, already done the adjusting of parameters you want prior to "exporting", or "opening". When you "open" or "export" you wind up with an "image" composed of pixels, whereas in the RAW adjustment phase you are just working with a temporary thumbnail and a set of mathematical instructions. Big difference, I suppose is that when you "open" and image from ACR into CS2, the resulting image is truly just pixels and has not had a "file type" applied to the file yet, until you "save" it, while in Aperture, if you "export" a file to CS2, or to the desktop, you end up with the file type already applied. Presuming you "export" a 16 bit TIFF or PSD, there is no operational difference.
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Hi All,
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javax.imageio.IIOException: Unsupported Image Type
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Thanks in advance
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The JPEG you are reading is a cmyk color space one. They're not common, but they do occasionally pop up in a collection of random jpeg images.
The default JPEGImageReader that comes with the jdk cannot read them. And it will throw an exception - the exact same one you got - stating it can't. JAI's behavior is a little worse. It will read the image without exception, when in fact it to can't read it. It doesn't handle the cmyk aspect right, so you get a messed up image.
The native JPEGImageReader that comes with installing [JAI-ImageIO|https://jai-imageio.dev.java.net/binary-builds.html] can read them. It appropriately decodes the ICC_Profile embedded within the JPEG and you get a cmyk BufferedImage. But if you wish to render this TYPE_CUSTOM BufferedImage, go grab a coffee while you wait for it to slooooowwwllly paint. You'll have to do a ColorConverOp to turn the cmyk BufferedImage into an rgb one (so Java2D can render it fast).
Having done all this you'll find that 1) ColorConvertOp makes the image too bright and 2) The native PNGImageReader that comes with installing JAI-ImageIO has an affinity for returning TYPE_CUSTOM BufferedImages (arggg!!!).
I'll help you fix points (1) and (2) if you get that far. Maybe the best choice is to simply give up on cmyk jpegs. They're only used in printing press environments, and people only use color space aware applications (like Photoshop) to manipulate them in any meaningful way.

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Thanks for your reponse Bob,
The image is fine in photoshop and a little worse in Indesign (display performance: High Quality), but when viewed on an ipad3 retina it isn't as hi-res?
The image I screen shot is 2048x1536. Placed in an Indesign 1024x768 document at 50% with Actual 72ppi and Effective 144ppi.
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Message was edited by: hcblue

when you say "Re-upload the image", do you mean reinsert it, or re-link it?
Neither.
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I'm new to the printing and dimension specifications in Lightroom. If I use 250ppi and 2000x2500 but then change that to be able to print a larger image (300ppi 3000x4200 - 10x14x print, for example), what exactly happens to the image when I increases pixels and ppi? Does it improve/degrade the quality?

Great advice from dj, a few further points from my own experience:
In the Print module, changing the Print Resolution setting simply informs LR to resample the image before it is sent to the printer driver (if the default is different to the current configuration). This has no effect whatsoever on your image.
In the Library module, Exporting the image is per advice from dj
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Elsewhere in LR, I am not aware of any method of resampling an image to increase pixels (interpolation). I have seen this in Photoshop (Image > Resize) but not LR.
I think the confusion comes from pixels and ppi. Pixels represents the actual ‘stuff’ in the image, this is not normally modified in LR per advice above. Ppi simply refers to how these pixels are distributed when viewed/printed. If you make the assumption that 72ppi is good enough for screen viewing then a 3000x3000 pixel image would be good for 3000/72 = 41 inches on screen. Assuming 240ppi is good for printing then the same image would be good for 3000/240 = 12.5 inches.
So ppi ends up being an indicator of view/print quality and nothing whatsoever to do with image quality.
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What exactly happens to the image when I increases pixels and ppi?
Increasing pixels resamples the image by interpolating adjacent pixels. Not something LR can do as far as I am aware. No additional ‘stuff’ is introduced, therefore no additional image quality.
Increasing ppi would distribute more ‘stuff’ in a viewed/printed image, thereby increasing the perception of quality.
Does it improve/degrade the quality?
Neither increasing pixels (in, say, Photoshop) nor PPI will increase the image quality. PPI would effect the perception of view/print quality per above.
NB I should also point out that your monitor resolution would also impact the screen view perception of quality.

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Check the status of OpenGL drawing in preferences.

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Is it possible to make small advertisements with photoshop,
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When having a conversation of my phone, these messages are not available on my desktop (like Skype). Is this intentional / bug / config?
Ben Weeks
SharePoint Consultant @ Webtechy Ltd
T: +441223922070 F: +448701315220
Web: http://www.webtechy.co.uk Blog:
http://blog.webtechy.co.uk

Mmm ... that's a shame (aka that sucks!), as typically means I end up missing messages while sat at my PC not realising my phone is receiving them and vice versa.
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Web: http://www.webtechy.co.uk Blog:
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Tyler/Chuck
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Someone please help!
I am going to write the "history" from my disk utility repair here so that other's who copy and paste into search may find it:
(PLEASE SCROLL 13 ROWS DOWN)
Verify and Repair volume “Your Hard Drive Name”
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Checking extents overflow file.
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1 x eSATA | 2 x FireWire 800 9-pin | 1 x USB 2.0
Self Powered DC-IN
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Get Disk Warrior that will repair the problems without requiring that you reformat the drive - $99.00 on a bootable CD. Will not work on a FAT formatted drive.
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4. Select the volume you just created (this is the sub-entry under the drive entry) from the left side list. Click on the Erase tab in the DU main window.
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How to change image resolution in oracle forms.

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1.
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Understanding image resolution and appearance across devices

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