Scale an image to actual size?

I often use the Crop Tool to get part of an image to print at actual size.
For example, Crop: Width 7cm @ Resolution 600 pixels/inch (same as my
printer), then select a known width of 7cm then crop and print.
I figure there must be a way without actually cropping the image, perhaps by selecting the known dimension.
I could do the math myself, but I figure Photoshop CS4 can do it for me.
Any suggestions?

Nigel: Here is a method that may work for you.
(1) Since you have PSCS4, you are able to convert your image to a
    smart object.
(2) Create a layer mask that corresponds to the physical size you
    would want the known object to print at. E.g., your known object
    (the coin) is 20.3mm wide, so you create a rectangular marquee
    that is 20.3mm wide:
    (a) Create an arbitrary sized rectangular marquee, then use
        Select->Transform Selection and enter the desired height and
        width into the object bar (e.g., 20.3mm <tab> 20.3mm) and
        commit. It doesn't matter where in the image you make this;
        all that matters is that you have a 20.3x20.3mm marquee.
    (b) Turn this marquee into a mask by clicking on the masks panel
        and then the icon second from the right. Unlock the mask
        from the smart object by clicking on the chain icon.
(3) Use this layer mask to calibrate the image against the known
    object:
    (a) Click on the smart object icon in the layer, then use
        Edit->Transform (with the aspect ratio locked) to move the
        known object (coin) into the mask and scale it so it just
        barely fits into its width.
    (b) Your smart object is now scaled properly in Photoshop. You
        should now delete (or disable) the layer mask, which is no
        longer needed.
(4) Use the Move tool, if necessary, and the Rectangular Marquee tool
    to select the area of the image to be printed.
(5) In the Print dialog, set scale to 100%. Don't use borderless
    printing, which typically reduces the printing scale slightly.

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You might look over the Photos.app apple community support forums for posts related to your question, like this one:
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I personally find Illustrator much more intuitive when it comes to things like the pen tool and vector editing, and options such as Live Color and Live Paint are likewise extremely useful. However, each piece of software has its own strengths and weaknesses, and if you can use the right tool for the right situation, I think you're in a good place
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Scanning actual size hi res images

I am cross-posting this message since I'm not really sure where I should post it.
I recently switched from a PC to the macbook pro and am using an HP photosmart C7100 series scanner. I cannot figure out how to scan images at actual size using this scanner and the macbook. (I had no problem doing it on the PC with the same scanner.) I have it set to scan to iPhoto.
What I actually need to do is insert scanned images at actual size into word docs. When I try inserting these scans from iPhoto into Word-- they are much larger than the original. I have tried changing scale and resolution settings and at one point was able to get the image the right size-- but the resolution was terrible. I really need a hi resolution but actual size. (Just for a little more info, I know it is possible to size the image down in Word- but for what I am doing, I absolutely need the image to be the exact size it really is- and these are not standard size images, so resizing in Word has not been an easy task.)
I have tried everything I can think of with the scanner and iPhoto. I'm at a loss. Does anyone have any tips?
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lana:
Welcome to the Apple Discussions. I don't think you're doing anything wrong. What resolution are you scanning at and what do you mean by actual size? Actual size is relative. A 4x6 photo scanned at 300 dpi will display much bigger on screen than a 4x7 photo scanned at 72 dpi. Both are 4x6 if you print them at their scanned resolution. If I were to scan a 4x6 photo at 72 dpi it will show "actual size" on the monitor since most monitors are at 72 - 90 dpi in resolution. However it will not print very well at 4x6 since there are only 72 pixels per inch in the photo. The more pixels in a photo the better it will print. I scan all of my prints at 300 dpi.
In Word you can resize the photo exactly by double clicking on the photo and entering the dimensions in the Size section of the Format Picture box that comes up. Otherwise you'll be sacrificing print quality.
TIP: For insurance against the iPhoto database corruption that many users have experienced I recommend making a backup copy of the Library6.iPhoto database file and keep it current. If problems crop up where iPhoto suddenly can't see any photos or thinks there are no photos in the library, replacing the working Library6.iPhoto file with the backup will often get the library back. By keeping it current I mean backup after each import and/or any serious editing or work on books, slideshows, calendars, cards, etc. That insures that if a problem pops up and you do need to replace the database file, you'll retain all those efforts. It doesn't take long to make the backup and it's good insurance.
I've created an Automator workflow application (requires Tiger), iPhoto dB File Backup, that will copy the selected Library6.iPhoto file from your iPhoto Library folder to the Pictures folder, replacing any previous version of it. It's compatible with iPhoto 08 libraries and Leopard. iPhoto does not have to be closed to run the application, just idle. You can download it at Toad's Cellar. Be sure to read the Read Me pdf file.

Scanning actual size, hi resolution images

I recently switched from a PC to the macbook pro and am using an HP photosmart C7100 series scanner. I cannot figure out how to scan images at actual size using this scanner and the macbook. (I had no problem doing it on the PC with the same scanner.) I have it set to scan to iPhoto.
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lana

Welcome to the Forums!
One tip might be to try Applications > Image Capture instead of iPhoto. IC allows full control over resolution, etc. I've never scanned to iPhoto, so if that allows full control as well then this tip won't helps.
However, I think this is an issue with how MS Office on the Mac handles images.
On my MBP, when I take a pic from a 4 megapixel digital camera (2288x1712 pixels) and insert that into a Word document (Insert menu > Picture > From File), then copy it, switch to Photoshop and create a new document based on the clipboard size, what I get is not the original pixel dimensions, and the size changes depending on how I scale the pic in Word. On the other hand, when I move the same image to my PC laptop and do the exact same thing, in Photoshop I get a 2288x1712 blank file in Photoshop no matter what I do to the image in Word.
So, unfortunately you may be stuck, unless someone else can offer a better suggestion. Word is really not the app of choice for desktop publishing, image manipulation, etc., but it's unfortunate that the switch impacted you in this way.
One possibility, assuming you still have your licenses for Windows and MS Office - use BootCamp to run them on your MBP. Clearly not an elegant solution.
If you can stand something of a learning curve, you might consider Mac desktop publishing software, something like the free, open source scribus, or Adobe InDesign.
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squidz wrote:
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Scale an image to actual size?

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