PPI or DPI?

When a printer says they need 150 DPI, is that the same as 150 PPI for my images in InDesign? And if not, how do I figure out the DPI?

DPI and PPI are not the same thing though most people use them interchangeably. I suspect that’s the case here.
Bob

Similar Messages

Is there a formula to show the ratio of ppi to dpi terminology?

I am preparing activity pages for a Pictorial Directory. Adobe Photoshop Elements only gives me the ppi. The company is asking for all pages to be 300 dpi.
They requested all pages to be 8.75 x 11.25. Does that automatically translate into 300 dpi?

Yes, do what they mean and not what they say . In fact a very small percentage of people saying dpi actually mean dpi, most mean ppi.
PPI is pixels per inch. Pixel stands for the smallest Picture Element. Pixels exist in digital files and pixels is also used for describing resolution of LCD displays where it means the smallest LCD picture elements (cells) of the screens. Pixels also can be used for the number of pixels camera sensors can produce.
DPI is dots per inch and is mostly used for smallest ink drop (dot) a printer is set to print. DPI can also be used for the samples of scanners and for describing the CRT monitors' resolution because the technology used for CRT monitors is more like printing dots than using fixed size cells as is the case with LCD screens, although when LCDs appeared on the market people started to use the term pixels for CRTs and some people used dots meaning LCD pixels and probably from there also meaning the same for pixels in digital files.

Ebook cover ppi and dpi help please

Hello,
I am working on an ebook cover. It seems that I have come across different numbers for recommended sizes. When using Photoshop Elements, I have the choiced of pixels or inches. Then ppi.
I created a cover at 300 ppi. I have read that it should be 72 dpi. Are the two numbers related? How do I make an image at 72 dpi in Photoshop Elements?
I am new to all of this.
Thank you

Use Image --> Resize --> Image Size
Type 72 into the resolution box.

DPI vs PPI - a definitive answer?

I've looked back at some previous discussions of the DPI setting in Aperture, and I've also read some online explanations of DPI vs PPI. Apparently software applications sometimes confuse the two, and I suspect that this is the case with Aperture but I haven't seen this definitely specified. Photography competitions that ask for high-res files often ask that you use 300 PPI (not DPI); but previous discussions of Aperture suggest that the DPI option (there isn't a PPI option) should be set to 300 for high-res exports. In other words, Aperture seems to refer to DPI when it should be referring to PPI. Is this correct?

LondonDave wrote:
Photography competitions that ask for high-res files often ask that you use 300 PPI (not DPI); but previous discussions of Aperture suggest that the DPI option (there isn't a PPI option) should be set to 300 for high-res exports.
PPI and DPI are often incorrectly used interchangeably but most of the time the improper usage does not hurt anything. However IMO we should ourselves endeavor to use the terms properly. Aperture uses the dpi term correctly because it is referring to an output device.
Much of the time "photography competitions" are just stealing your image one way or another, so the image spec is just to get it into the form they want to harvest. <OK I am a cynic...>
When the contest spec is making sense usually it is just specifying linear size (inches or centimeters) x ppi (like 300 ppi) to achieve consistent linear pixel dimensions, which are what really matter. So if they want to harvest what would be typical 8x10 print quality image files they specify 8" x 10" at 300 ppi: the important net result is that every contestant provides a (8x300) x (10x300) = 2400 pixels x 3000 pixels file.
Or they could specify 24" x 30" at 100 ppi: net result (24x100) x (30x100) = 2400 pixels x 3000 pixels file.
Or maybe it is a size-righteous competition, in which size as viewed matters. After all, we all know some pix show well small while others demand large presentation. In that case they may only specify the ppi. The photog determines the presentation size. E.g. 300 ppi is specified and one wants to present at 4" x 4" it would be a 1200 pixels by 1200 pixels image submission.
-Allen

What PPI/DPI should I use when making a DVD menu in PS?

I am making a movie in HD and am wondering either the PPI or DPI recommended. Thanks!

a13firman wrote:
Sorry to resurrect this but when I burn the menus to a DVD they look sort of fuzzy. Now if the PPI doesn't matter what can I do to increase definition? I used the DVD Presets that PS provides
You are either authoring/ transcoding wrongly or, assuming you refer to subpictures (buttons) looking rough around the edges, see normal behavior for a DVD. This has nothing to do with how the graphics are prepared in PS. In case one it's am ater of chosing the right settings, in case two it's a design limitation of the DVD(Video) specification. If you can tell us, what exactly you do and what program you use, we may be able to provide some tips.
Mylenium

How can I view resolution in DPI and not PPI?

Hi all,
Under Bridge>view content as list, I got a column of Resolution but the mesurement are ppi and not dpi and i need to see the dpi.
Anyone knows where can i set it?
thanks..
shlomit

Shlomit,
Strictly speaking, images do not have dpi (ever), only ppi. Images are made of pixels, not dots.
Dpi refers to prints.
However, in everyday use, the terms are loosely used interchangeably. They work out to exactly the same thing (same numbers), but ppi is the correct terminlogy.
See: http://www.scantips.com/basics01.html
DPI, PPI, SPI - What's in a name?
Printer ink dots and image pixels are very different concepts, but both use the term dpi in their own way (dots per inch).
Inkjet printer dpi ratings refer to printer ink dots (the four colors of ink), which is NOT AT ALL the same thing as image pixels. These are such different concepts that some people think we should reserve the term dpi for those inkjet ink dots, and reserve use of ppi only for image pixels. Not a bad plan, except that this view fails to recognize real world usage.
We may hear scanning resolution called spi (Samples Per Inch), and that is indeed what it is. We often hear image resolution called ppi (Pixels Per Inch), and that is indeed what it is. The spi and ppi terms are correct. But historical and common usage has always said dpi for image resolution, meaning pixels per inch, and fully interchangeable with ppi. Pixels are conceptually a kind of colored dot too, and resolution has always been called dpi, for years before we had inkjet printers. Dpi is just jargon perhaps, but it is a fact of life. Scanners and scanner ratings say dpi too, meaning pixels per inch (see dialog pictures here, here, here, and here). I habitually always say dpi myself, but I did try to switch to ppi in the book version.
We may use the term of our own preference, but we need to understand it both ways. Some photo editor programs have switched to saying ppi now, which has much to be said for it. But others have not switched, so insisting on conformity for others to only say ppi will necessarily encounter much frustration, because the real world simply isn't that way, and obviously is not ready to switch yet.
My point here is that we must understand it both ways, because we will see it both ways, often, in the real world.
It's easy, not a problem - the idea of printing digital images is always about pixels per inch, so when the context pertains to images instead of printers, all of these terms, spi, ppi, and dpi, are exactly the same equivalent concept - they all mean pixels per inch.
There is no problem understanding any use of dpi if you know the context. It always means the only thing it can possibly mean. If the context pertains to images or printing pixels, dpi means "pixels per inch". If the context pertains to inkjet printer ratings, dpi means "ink dots per inch". There is no other meaning possible. This should be clear and no big deal - the English language is full of multiple context definitions.

PPI VS. DPI in verbal printing discussion

Hi,
I was wondering If I could get a professional opinion on how DPI and PPI should be conversed with a print vendor?
This would include screen printing and offset printing.
Also, for years when I talk with a designer, I always asked to save as 300 DPI…not 300 PPI thats just the language I have been used to.
Can someone please give me an endepth explaniation of the two choices and which is more common to use.
Personally I think DPI is the more current to use.
Thanks…please advise,
JB

They are used interchangably (unfortunately) and if they ask for 300 DPI then you can be confident that they mean 300 PPI.
However, this doesn't make it correct: there are no "dots" in a digital image, never have been and never will be. There are only pixels. PPI is the correct unit of measurement, and that's only if you know the print size; the actual resolution of a digital image is the total number of pixels, for example 1500px by 850px -- until you determine the output size there is no PPI measurement. Of course you need to know the output size in order to give them 300 PPI; scanning an image @ 300 PPI and then enlarging it 200% in your layour will give you an effective resolution of 150 PPI.
DPI refers to output resolution of a device such as a printer, imagesetter, platesetter, etc. It does not refer to linescreen (that would be lines per inch, or LPI).
The best way to avoid confusion in any discussion is to use proper terminology (and teach and encourage others to do the same).

DPI or PPI during cropping?

Is there a way to get a readout of the PPI or DPI in real time during cropping?
Regards,
David

"Set one of them that you prefer to either cropped dimensions or megapixels."
Yes, that shows the info I often need to see when cropping, but shouldn't there be something approaching instant feedback showing latest cropped dimensions (as in Photoshop)? On my Mac G4 1.47GHz (dual processor with 2 Gb RAM), LR seems to require approx 10 seconds before updating the info display to show current cropped dimensions. Is this typical? That's painfully slow feedback and makes cropping to a fixed pixel dimension a very tedious process.
Phil

How can I set DPI for a document in illustrator?

I'm designing a user interface for iPad (Resolution: 1024x768, DPI:132). Setting the resolution is a piece of cake but when I change the ruler unit to Centimeters, it shows the screen about 36x27cm which is not right (iPad screen is 24.3x19cm).
Illustrator calculates these lengths based on the DPI. But when creating a new document the only available DPI's are: 72, 150, 300 (File > New > Raster Effect). I searched for the answer on this forum and googled it and looked into the help but couldn't find a satisfying answer. I know that Illustrator is a vector design program but there must be a way to set the DPI to an arbitrary value.
How can I have a 1024x768px artboard in Illustrator that is 24.3x19cm? (DPI=132)

Alex,
only when I'm printing or saving the image for the web, Illustrator will ask me the actual width.
Almost. Illustrator won't "ask you for the width." As with any program, when you export a vector graphic to a raster image, you have the opportunity to specify its resolution, in number of pixels. Illustrator tries to "simplify" (and thereby often confuses) this process by providing different interfaces for the same thing. The so-called "Save For Web" interface is just another way to export a raster image (and other web-centric things, like slicing). The settings available (or at least the ones most prominate) differ between the straightforward Export dialog and the Save For Web dialog.
My question is: how illustrator calculates these measures?
Again: When Illustrator's rulers are set to "Pixels," they are really set to points. A point measures 1/72 inch. So Illustrator assumes a "pixel" is scaled to measure 1/72 inch, even though it may not be in a particular raster image object you have on the page.
But when you export as a raster image (in other words, rasterize the artwork), you don't care what those pixels are scaled to due to the actual, physical, hardware dimensions of the device's monitor pixels (so-many centimeters by so-many centimeters). Regardless of whether the device's hardware pixels are gigantic or microscopic, you just care how many of them there are. So long as you export your finished artwork rasterized to that number of pixels, it will effectively be scaled (in terms of actual measure) by whatever device it is displayed on, becasue the device is going to "turn on" a monitor pixel for each pixel in your image.
In other words, when designing purely for electronic displays (as opposed to printing), forget all about PPI, or DPI, which are nothing but scale factors, and forget about the actual measure (centimeters x centimeters, inches by inches) of the monitor.
If I display your 1024 x 768 image in a web browser on my 15-inch-diagonal Toshiba laptop, your image is going to occupy 1024 x 768 of my monitor's pixels.
If I display your 1024 x 768 image in a web browser on my 10-inch-diagonal Acer netbook, your image is going to occupy 1024 x 768 of my monitor's pixels, and it will display at a smaller actual size than it does on my Toshiba, because the Acer's monitor pixels are smaller than the Toshiba's monitor pixels.
But even though the image's actual measure is smaller on the Acer, and even though your image occupies the exact same number of monitor pixels on both the Acer and the Toshiba, I will have to do some scrolling on the Acer because its monitor has fewer hardware pixels.
So if I'm designing images to fit neatly on my Acer without the need for scrolling, I care about its screen size in terms of number of hardware pixels, not in terms of actual measure (centimeters or inches).
I want to be able to set the lines and curves in terms of pixels.
Because Illustrator considers a pixel to be a particular measure (1/72 inch), work with your rulers set to either the bogus PIxels or to Points (which, in Illustrator, is the same thing). Forget about the dimensions of a device screen. It doesn't matter.
If you want to also spec type in terms of "pixels" you can also (pointlessly) set your General Prefs to use the bogus Pixles as the "Unit Of Measure". But this is pointless because in Illustrator, a so-called "Pixel" is, in fact a point already, and Points is the default UOM for type. Either way, you have to realize that any measure for type (using "Pixels" or Points) is a measure of the font's em-square, not the measure of the actual glyphs. So setting your type to "9 Pixels" doesn't mean the type characters are going to occupy 9 pixels in height.
But you can proceed to specify line weights, box sizes, etc., etc, in terms of ruler units (bogus pixels or legitimate points).
Alternatively, if you want, you can set your rulers to Centimeters. And then as you draw your boxes and set your stroke weights, you can specify them in terms of Points or "Pixels" by just typing "pts" or "px" after the measures you key into the various dimension fields.
But after all this is said and done, the point you're missing is still this: All that means nothing if you don't export the resulting images to the number of pixels that you want them to occupy on the device you are designing for. In other words, you can work with your Illustrator rulers set to "Pixels" all day long; but if you then export the artwork to a raster format using a Pixels-Per-Inch setting other than 72, It won't be the right size, because Illustrator still thinks a Pixel measures one point.
So regardless of how you have your rulers set while working, it is just simpler (and more legitimately meaningful) to export your raster images in terms of number of pixels (N pixels x n pixels), not by PPI. That brings us full-circle right back to where your question started: There is no document-wide PPI for an Illustrator file.
But what you have to understand is this: If your design includes already-rasterized objects, the number of actual pixels included in each of those raster objects is entirely independent of whatever Illustrator's rulers say they "measure" in "Pixels". That is very important. Because if you use as part of your design a raster image that is scaled to anything other than 72 ppi, and/or that image does not align to a point-size increment of Illustrator's grid, then when you export your final product, that image is going to be re-rasterized to whatever PPI you export, based on its on-page position and the quality of that image is going to be compromized. That's why it's important to understand that "Pixels" is bogus as a unit of measure in a program like Illustrator.
In pursuit of web- and device-centric creative markets, Adobe continues to add confusion-generating "conveniences" to Illustrator. For example, to workaround Illustrator's problematic antialiasing, version CS5 added a feature called Align To Pixel Grd which causes vertical and horizontal strokes to align to whole-"pixel" increments, to avoid antialiasing of those edges.
There are also probably templates in your AI installation (depending on version) already set up for mobile devices, and there's the whole "Device Central" online thing, if you're inclined to use that kind of thing. So look up and read about those features.
JET

Increasing ppi from 72 to 300?

I'm by no means a graphic designer, but my job is having me create a 3' x 2' poster (300 ppi) using Photoshop CS3. I am trying to place a few logos on the poster but am having difficulties. My logos are currently about 20 inches wide, and I would like to keep them this width. However, the resolution is 72 ppi. Obviously when I change it to 300 ppi, Photoshop automatically decreases the image size. Is it possible to make the logos 300 ppi and keep the original document sizes?
Or, alternatively, I would like to print this poster on canvas with a local printing company. Is it possible for me to create a smaller version of the 3' x 2' poster (perhaps with a smaller ppi?) without losing too much of the clarity, which the printing company could then blow up to 3'x2'?

300 ppi for a 2 x 3 ft poster is way way over kill.
You dont need 300ppi unless you are going to view this poster from a normal reading distance of 12 inches from your eyes, and even then you dont need 300ppi. 200-300 will suffice for 12 inch reading distance. Remember that when printing, each pixel is formed by many ink dots. The dpi is much larger (may be 1200 or more) than the ppi.
Posters are normally viewed from a much further distance (3-4 feet) and 100 ppi is very good. Check with your printer as to what they recommend, but be aware that many printers dont always understand what they are doing. The type of paper that is being used is also important. Is this high gloss coated stock or cheaper paper. Ink bleeds on cheaper paper and you cant get the same resolution as coated stock, so your higher resolution images dont even matter.
Forget the ppi setting in PS. The important information is you w x h in pixels. You can print any image at any size you want.
I would set my canvas for 2400 x 3600 pixels which implies 100ppi when printing at 24 x 36. If you want over kill go to 3600 x 5400 pixels which implies 150 ppi.
Your logs are 1440 x 1440 pixels which will be either 14.4 inches or 9.6 inches. If these are too small than you either redesign them or up sample them. Your choice.
Ed
reference ppi vs dpi
http://www.scantips.com/basics3b.html

How to export at 72 DPI, rather than 71.98 DPI

Hi all,
CS5, OS X 10.6.4
Australia (system set to metric measurements)
Images being exported from FW here have a 71.98 DPI resolution despite Document Image Size having Resolution set to 72DPI exactly.
Any tips, workarounds?

I like Jim's answer on this—i.e., a pixel is a pixel. If an application is attempting to render the image based on ppi (or dpi) information, then it's really performing a sort of previewing, or sizing simulation. And I'd look to see if that feature can be turned off.
Mac's Preview application has long offered this option, under various names, and it can be turned on or off within Preferences. Here's how that preference appears in OS 10.6. It's the bottom option, "Size on screen equals size on printout", that accounts for pixel density in its image rendering. For example, an image set to 72 ppi will suddenly increase in size (on a typical screen) when this option is chosen.
Speaking of Preview, it includes an option to adjust Resolution under the Tools > Adjust Size command. (I believe you'd want to deselect "Resample Image" before making any adjustments in this dialog.) If Fireworks is letting you down, perhaps this option could help you out in a pinch.
It might be helpful here to know what application is providing you with the specific dpi information and/or what application is "receiving" these graphics. If the saved graphic is reopened in Fireworks, does Fireworks still indicate 72dpi? Is it simply rounding up? Does dpi fluctuate slightly between graphics of different pixel dimensions?
Finally, if the metric system is somehow an issue here, have you tried using metric sizing instead? (Following is the Modify > Canvas > Image Size... dialog within Fireworks 8, with 72ppi being converted to 28.346 pixels/cm.)

How do you change the dpi on photos?

I am writing a book and inserting old photos into it.   These photos were scanned by people and sent by e-mail.   I need to change the dpi on the photos to 300 dpi for printing purposes.   I have just bought Lightroom, so I don't know a lot yet.   But, my first project is changing the dpi of these photos and inserting them into my book.   Thank you.

victoriafinland wrote:
I am writing a book and inserting old photos into it.   These photos were scanned by people and sent by e-mail.   I need to change the dpi on the photos to 300 dpi for printing purposes.
Actually, you don't need to change the resolution (which is PPI, not DPI), and anyway, you can't do this unnecessary thing in Lightroom. You do need to have enough pixels in the image to print at the desired size. So, for example, if the book calls for a 4x6 space to be filled with your photo, then you would need a photo that is 1200x1800 pixels (or larger). If your book requires the photos outside of Lightroom, then you would Export the photo (if necessary, enlarged) to the desired number of pixels, as in the example.
I have just bought Lightroom, so I don't know a lot yet.   But, my first project is changing the dpi of these photos and inserting them into my book.
So based on the fact that this is an unnecessary task, and that Lightroom won't do this anyway, your first project is now completed.

Placing Images and PPI issues

Hello, I am new to InDesign.. I am a digital artist who has only used PS in the past, so I'm used to manipulating images however I like concerning PPI, DPI, and pixels. I am now creating an app for ipad use and created the background images for the pages in PS. Now, I'm placing them into ID. When I do that, no matter what I have the file saved as, it converts the image to a different ppi.
When I created the images in PS, I used the standard ipad resolution (262px) and dimensions. When I created the ID file, I used the standard ipad dimensions and the ppi is obviously much lower, at 72?
Is there a way to set the ID resolution, or do I need to create my documents with only 72ppi? This doesn't seem like it would give the best image viewing available on the ipad.
Thank you!

InDesign respects the original size and resolution of images, as long as you keep them at 100% of the original size. When they are at 100%, the "Actual ppi" and "Effective ppi" fields of the Info panel display the same value. In your specific case, the Info panel needs to show "262" in both fields. If not, it means that the respective image is scaled. To verify its scale, click the image using the Direct Selection Tool (the "white arrow" one) and look at the percentage fields in the Control Panel. (By the way, the resolution of the retina iPads is 264 ppi, not 262.)
When importing an image, the easiest way to assure that it will be placed at 100% is simply clicking the loaded cursor instead of dragging it. Give it a try.
But bear in mind that this "ppi" issue only matters for print publications. For tablet apps, what is important is the number of pixels; the resolution is irrelevant. For retina iPads, you need to use twice the size you use in a standard screen iPad. So, if you want a full-page image in an old iPad, the image dimensions must be 1024 by 768 pixels. If you want the same image in full screen on a retina iPad, create it with 2048 by 1536 pixels. You'll get a better explanation here: http://www.planetquark.com/2012/03/14/132-ppi-72-dpi-264-ppi-what-image-resolution-should- you-use-the-for-new-ipad/#.UhdbsLwWFL8

Specific pixel size & dpi

Is it possible to set specific a combination of size (in pxls) and dpi? (in Illustrator CS5)
I need to create a .png document which is 16x16 px and 96dpi. The ability to chose the dpi size when setting up a new doc is very limited.
The only thing I've managed to do is create a 19x19 px 72dpi image, export it "for web" and then take it into photoshop and change the dpi to 96.
Is there a better, easier way? Also, we're considering upgrading to CS6 - are these features better in CS6?

Bidds, you are confusing DPI (Dots Per Inch) with PPI (Pixels Per Inch).
DPI is a technical specification of the output or input of hardware devices like a printer when you print, monitor when you display your digital image, scanner when you scan to make digital images, and etc. For printers DPI specifies the size of the ink drops when printing. For monitors, DPI specifies the monitor's resolution or in other words the size of the monitor's pixels. The term DPI for monitors came from the use of the CRT displays (those heavy monitors and TVs in the past with big tubes) which are no longer in production. These displays used guns to shoot light at the back of the screen with variable size dots and the term DPI perfectly described the monitor resolution used. Today there is only LCD displays on the market and thy use fixed cells which define the monitor resolution. Because the cells are fixed, for describing the resolution of LCD monitors, people mostly use the term Pixels Per Inch when they want to describe the size of monitors' pixels (cells). And this can cause some confusion that you are experiencing.
PPI is an attribute of a digital raster image. It specifies the output resolution of a raster image or in other words how large the pixels in the digital file will be output.
In Photoshop you are setting PPI not DPI.
Illustrator is a vector program. Vector graphics are resolution independent (have no pixels) and don't have PPI attributes. The PPI attributes are valid only when creating a raster image for outputting to devices like printers. Printers can print the pixels of your digital image with different size, and thus the image with the same number of pixels can be printed with different sizes. Monitors however don't use PPI settings of digital files to display images, instead they use the zoom level specified by the user using software, and by default the software programs (your browser for example) use 100% zoom which fits one image pixel to one monitor pixel. Because different monitors have monitor pixels (cells) with different sizes that cannot be changed on LCD screens, a digital image with the same number of pixels will be displayed at different size at the default 100% zoom on different monitors. Also have in mind that certain elements like software interfaces cannot be zoomed (changed) by the user.
So, the DPI mentioned in the link you provided does not mean PPI and it doesn't suggest in anyway that you should set PPI in Photoshop or any other program when creating images for the web. You got that wrong. It is only telling you that monitors with higher resolution (DPI) will display your image smaller so, you may want to make the image larger (with more pixels) and vice versa. The PPI settings in a raster image are simply ignored for display on monitors and thus on the web. That's why you don't have an option for PPI in Save for Web and devices. Whether an image with a certain number of pixels is 72, 96, 300, 1 million or 1 PPI (pixels per inch) this will not make any difference when displayed on the web.

Photoshop document changes to 72 dpi from 300 dpi when receiver opens it.

I created an ad for the newspaper at 300 dpi. I emailed it and received a call it was at a low res of 72. I know I created it and saved it properly. I researched and found I should uncheck the resampling box when saving the document. I did that and resent, same issue.
I have recreated the ad over 20 times and sent it all with the same issue. I just hung up from Adobe after spending over an hour on the phone with them, having them take over my computer, e-mail it himself after creating his own 300 dpi document and the same result. Basically, Adobe is telling me it isn't their problem, it is my server. I sent it from Yahoo and Microsoft and still 72. Even sending as Tif, 72 dpi.
I am at a loss. I don't know what else to try and this ad needs to be in the newspaper in 2 days.
Does anyone have a suggestion? I'm desperate.
Thanks,
Mary

It is very usual for many applications (such as the receiving party must have) to open JPEGs at 72 ppi by default but without resampling, i.e. maintaining the exact number of pixels, so many pixel wide by so many pixels high.
It is then a trivial matter for the recipient to change it back to 300 ppi without resampling to go back to your original.
Incidentally, it's ppi not dpi.
The fact that you say the resolution and the size (pixel dimensions, or so many pixels wide by so many pixels high) does change makes me suspect that you may be using Apple's "Mail" program to email your files. Mail is notorious and (in)famous for reducing the size of your attachments at will if it deems it appropriate or necessary, as in "nobody in his right mind would want a JPEG that big!" Grrrrrr…
Ideally, you should switch to a decent email program. I use MS Entourage, part of MS Office.
The workaround is to archive or "zip" your image files before attaching them to Apple's Mail, so that you end up with an archived or zipped file that Mail can't touch, as it won't even know it's an image file.
If you are not using Mail, you'll have to continue troubleshooting.

PPI or DPI?

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