Pixel dimensions in CS2

I opened a jpg image in PS CS2, and opened the Image size panel. I found the following: Width 2304 px., height 1728 px., doc size 32" x 24" at 72 px/in, and Pixel Dimensions 11.4M.
Can anyone explain the relationship of the pixel dimensions to the other data, i.e., how the pixel dimensions are calculated.

Thanks Phos.
From http://firesign3.com/glossary.html, Pixel Dimension is defined as..."The size of a computer display screen expressed in horizontal pixels by vertical pixels (H x V, or 800 x 600, for example)".
From http://www.scantips.com/basics1b.html: "If the image size were say 1000x750 pixels (written as width x height by convention), then there would be 1000 columns and 750 rows of data values, or 1000x750 = 750,000 pixels total. For 24 bit color, each pixel's data contains three 8-bit RGB byte values, or 750,000 x 3 = 2,250,000 bytes".
In my example I have a 2304x1728 image. If I multiply those and take 3 times the product, the answer is 11.9 Mpx, while Photoshop gives "Pixel dimension" as 11.4M.
So now I have three questions
1. Why the difference between 11.9 and 11.4?
2. Are the three colors included in the definition of pixel dimensions? Are there actually 3 pixels (i.e., red, green, blue) for every point in the 1024x1728 array of an image?
If you blow up an image on the screen, you see each pixel having one out of 16.777M colors, based on the relative weights of the three colors. But it is one pixel.
3. What am I missing?

Similar Messages

Custom cropping using pixel dimension

The banner image module for my website requires images cropped to 940 x 400 pixels. When I use the Custom cropping function in PSE 12 (on a Mac OSX 10.9.2), it only shows a cm dimension. Can I do a custom crop using a pixel dimension?

You should just be able to type 940 px and 400 px in the width and height fields
Another way is to use the Rectangular Marquee Tool and use Aspect>Fixed Size then enter 940 px X 400 px

How do you find the pixel dimensions of a photo to embed in Illustrator CC?

We recently upgraded our software from CS3 to CC. I'm having trouble determining the pixel dimensions of the photo I want to embed in Illustrator. In our old work flow, we simply clicked on the object in Illustrator, and then opened a new document in Photoshop, and it would retain the dimensions at our document size in Illustrator. It was then a simple matter to paste the photo into the box, position and crop and save as a PSD file and then place in Illustrator. That does not work any more in Creative Cloud. The object downsizes to 72 DPI while retaining the resolution setting. We need to keep our Illustrator files to the minimum, so embedding larger than needed files is not possible.
I've researched a bit and I see others with similar problems, but I haven't seen a workaround or a way to determine the pixel size. Document info in Illustrator gives the 72 dpi pixel settings, even though the document is set to reproduce at 200 dpi.
This is something that used to be so simple I didn't think much of upgrading. Now my workflow is horrendously long. I have to rasterize the entire graphic and then crop what is the inset photo. If there is a simpler way, please tell me. All the literature is backwards, about placing an already sized PS image into Illustrator. I need the other way 'round.
Thanks in advance for any help.

I think I have a workaround: Make sure the clipboard settings are on 72 by cutting and pasting a 72 dpi file in PS, as it seems Illustrator images are seen that way, no matter what the output resolution is. Click on Photoshop and start a new document. It will retain the proportions of the Illustrator image in 72 dpi. Then open image size and make sure the resample box is checked. Change the resolution to the desired, in my case 200.. Then place and crop your photo, and save the PSD file. Open Illustrator and place the PSD file. This works for me.

How to find out the Pixel Dimensions and Document Size of placed images?

Is it possible to find out the placed image details like Pixel Dimensions(Width,Height) Document Size(Width,Height) in illustrator through scripting. Kindly advice me with some examples.

http://www.adobeforums.com/webx/.3bbaa316.59b84fd8
I hope the snippet therein will get you started.
But after all, when you place an image via pi=layer.placedItems.add() it should pop in with its default dimensions, so that you have pi.height and pi.width ready.
Is this what you are aiming at?

Is there any way to batch change resolution, but not pixel dimensions?

I was changing the resolution of my digital photos from 180 to 300 ppi individually as I edited them, but sometimes I would forget. Since I need the higher resolution for printing, I decided to automate that step by using PSE's "Process Multiple Files" feature. I noted that the Resolution selection was grayed out until I checkmarked "Resize Images." Since I didn't want to change the number of pixels, I left those fields blank.
When I started the automated processing I noticed it was terribly slow, so I cancelled it and looked at the resulting files. They had more than doubled in file size because PSE was nearly doubling the Pixel Dimensions! I don't want to try a work-around by "resizing" to the current pixel dimensions, because the processing still takes about 45 seconds per file, and if I've cropped the photos, the pixel dimensions vary. Is there an automated way to change only the resolution in PSE . . . quickly?
Also, I really wanted to double the resolution from 180 ppi to 360 ppi, but PSE limits my choices to either 600 or 300 or less. I've read about Scripts, but I don't think PSE supports them. I have version 6.
Thanks for some help.

Thanks for your input, and you may be right, but I'm not sure. I'm still trying to figure this out. I know it's the same photo on my monitor, but I keep reading that print resolution (ppi) is different from pixel resolution (i.e. 2000x3000.) This is my situation-- I'm sending the photos to a publisher for printing in a book. The publisher did not specify a size in inches--in fact I think the photos will be different sizes when printed on the page. They told me to send the photos in at 1600x1200 pixels. I've heard that 300 ppi is the standard resolution for publishing, so to get decent quality printing of my photos I thought I should increase the resolution from 180 to 300. But thinking about the different sizes, it seems that the resolution (ppi) will change depending on the size the photo is actually printed. At 300 ppi, a 1600x1200 photo will be printed at size 5.333" X 4". If a photo is printed full bleed on the cover of the book that is 8" x 10.667", then it will be 150 ppi. So, I guess you are right that I don't need to worry about the ppi resolution for the book photos.
Now, let me figure about what I need to print my own 4x6 photos. My digital camera was set to 16x9 jpg, so my workflow is to make PNG copies to work with and after editing, save them in the 16x9 format before cropping at 1600x1200 pixels, then sharpening before doing Save As jpg in Book folder. I was thinking I needed to change the resolution to 300 ppi when saving in the 16x9 format so if I want to later make 4x6 prints, I'll have good quality prints. But you have made me think a little harder--what I do is choose the 4x6 crop tool which takes care of whatever ppi resolution is needed for that size print. Oh good, you have saved me extra work. Thanks!
(BTW, I choose the 16x9 format because I was planning to use the photos in a widescreen slideshow, but my husband wanted something he could hold in his hand--hence, the book . . . and a lot of cropping!)

Where is it possible to batch process the size of images?--I am able to change pixel dimensions in image processor but not image size in inches.

Hi- I need to batch process images for video project. I am able to change the pixel dimensions in the image processor but don't seem to have the option to change image size in inches. Please advise! Thanks

You don't need inches for video (or screen viewing in general). It all goes by pixel count. Inches is for print, nothing else.
But to answer the question, you can run actions in the Image Processor, and this is where you set size in inches. Just bring up Image Size, uncheck "resample image", and specify size. You'll notice resolution changes to reflect the fact that the existing image pixels are now redistributed over the new print size.
But again, screen doesn't care about size or resolution. It only counts pixels.

How do I change DPI in Photoshop CC without changing the pixel dimension of the file?

I used to be able to do this in Photoshop CS6 by simply clicking the check boxes in the "image size" dialog box:
scale styles
constrain proportions
resample image
(all boxes UNCHECKED)
Then input the dpi (usually converting a 300dpi print file to 72dpi for web). And the pixel dimension will stay the same.
In CC the only option I see is "scale styles" which does not apply to the pixel dimension of the file.
Please help. I would hate to have to do this function in CS6 all the time.
CS6:
CC:

Just uncheck the [ ] Resample checkbox, then change your Resolution.
Change the units from Percent to Pixels if you want to see pixel dimensions.
Once you've successfully run it through (after OK), note that it will remember your units settings the next time you use it.
-Noel

Would a photo with 70MB in pixel dimensions but low resolution print clearly?

Hi there,
Here is a snapshot of the image size window:
Is it true that if pixel dimension is very large in size than the resolution number under document size doesn't matter ?
I really woudl appreciate your help in telling me if my photo will print clearely choosing the belwo document size.
Many thanks!

This is the easiest way for you to get an acurate idea of what your image will look like printed...
1) Create a new document the size it will be printed and set the resolution to 300dpi (pixels/inch). (Due to the size you are going for I suggest using RGB instead of CMYK)
2) Open the file you created and (using the 'Move' tool) drag it onto the newly created document.
3) Zoom in to 100% and what you see is what you get when printed.
The distance the print will be viewed from is important however, for example, if it's a billboard the viewer is pretty far so the quality is pretty forgiving and a resolution of 200dpi should work.
Feel free to hit me up and send me one of the pictures and I will give you an acurate judgement on how they will look printed at that size.

Changing ppi changes pixel dimensions but not document size?

I have an image that is W=4.375 H=6.124 at 355 ppi the pixel dimensions area under Img > Image Size indicates it is W=1553 px H=2174
When I change the resolution to 72 px it is only changing the pixel dimensions and not the document size. I'm confuesed.
1. What is the difference between pixel dimensions and document size?
2. Is the document the same physical size regardless if I make it 200 ppi, 150 ppi or 72?
Thanks.

Let me see if I understand all of this:
- If I change the resolution the print dimension will stay the same, though what is it actually doing to the image if I increase the resolution, though it still is the same print dimension? I am guessing you can not just add pixels to a given size image and expect it to print better.
- If I change the dimensions, the resolution will change because there will be either more pixels for a smaller area or fewer pixels for a larger area, depending on how I size it.
Thanks.

Image files with large pixel dimensions display out of focus in a Bridge viewer?

I Create image files with pixel dimensions 2048x1365. When I display these files from Bridge on my Mac, either by pressing the space bar or in a slideshow, the images are out of focus. If I left click or click/hold and move the images slightly on screen they display in sharp focus. Unfortunately, although landscape-orientation images display correctly with no change in position or size, portrait-orientation files are enlarged and display with top and bottom off the screen. The pixel dimensions of my monitor are 2450x1600 so, yes, if portrait images are displayed at 100% they should display off screen, but this does not excuse the out of focus display of landscape files on this large screen. Nor does this explain why the portrait files are out of focus when they fit on screen. When the same files open in a Camera Raw window they are in focus. When they open in Photoshop at 100% the files are in focus.

Hi, Clay. Photoshop.com has its own forum, so you might want to post this there:
http://forums.adobe.com/community/photoshopdotcom

How to reduce jpg file size, not pixel dimensions?

I am preparing images for the web and I really have 2 questions: one about gifs, and one about jpgs.
My standard procedure is to reduce the image to the desired pixel dimensions at 600 dpi
That gives me a crisp small image. then I either use it as is if the file size is low enough (I try for under 600 kb) or convert it to a gif with the save for web and devices tool.
So here are my 2 questions (I will count this solved with either answer)
1) When I convert to a gif I have the 4 boxes: one with original size, the other 3 with options but often the options are too low res for me How do I change my 3 options to start at a higher gif res?
2) If I try to reduce the file size of the jpg in the image size box I set the resolution lower ( 400, 300), which lowers the pixel dimensions and the filesize, but I don't want to cahnge the pixel dimensions. And If I reset the pixel dimensions back to the size I want them, even though it is a lower resolution the file size doesn't change. How to reduce jpg file size using only the resolution, not pixel dimensions? PS I have tried messing with checking and unchecking the 3 little boxes( scale styles, constrain proportions, and resample) but nothing has worked.

Gif is not a great filetype, especially if you want a crisp image. What are your pixel dimensions?
For web, it makes no difference what the dpi is, only the final pixel dimensions so once you have that as you want, use 'Save for Web and Devices' and you can lower the quality - 100% being max and 0% being lowest. I wouldn't save anything below 55%. For a 600kb image, your dimensions must be rather big.

Pixel dimensions for still images

Hello all,
I have just ran into a problem that seems to be a sizing problem with Final Cut Express HD. I used to crop my still pics to 1366 px - 768 px (for landscape) and then import them to FCE and export as a quicktime movie. When I brought the quicktime movie into iDVD and created the DVD it seemed to play great on my 46" Samsung tv -- full screen.
I just recently bought a Samsung 60" and when I create the same type of movies, I am getting a huge black border around the whole image (not just top and bottom but sides too). I tried creating a new movie and made all my still images 1920px x 1080 px, and it still comes out the same way.
I can stretch my tv so that they go full screen, but I think there should be a way to create the movie without having to stretch it....just have the tv set for 16:9, and I feel that it should work.
Any help would be greatly appreciated...thanks.
Norm

When you create a DVD, no matter what the pixel dimensions of your original material, it become 720x480 Standard Definition. This is what a DVD is. If you are creating a DVD that has material that is 16x9, then it creates a DVD that is 720x480 but plays back anamorphic, stretching to create the 16x9 screen.
If you play one of your older DVDs that played correctly on your previous TV, does it play correctly or does it also exhibit the black bars?
If it plays correctly then something has changed in the way you are creating your project in FCE.and encoding and burning the DVD.
If the older DVDs also exhibit the same playback problem, then I believe there is a menu setting on your new TV that will tell it how to display Standard Definition material from your DVD player, and you need to adjust that. (There are also settings in the set-top DVD player that tells it what kind of signal to send based on the what kind of display it is hooked up to.)
MtD

Sort by file size and/or pixel dimensions

I am constantly frustrated by the lack of ability to sort by file size or pixel dimension. I have many versions of the same images, and often want to find the biggest one, or one of a certain size, and it's very time consuming to have to scan all the numbers in the metadata instead of being able to sort. Please add this.
Thanks!

DevMeta will allow you to filter/collect by width and height dimensions.
PixelCountMetadata will allow you to filter/collect by total number of pixels (width x height).
Now that I'm thinking about it, I should probably have just added the pixelcount metadata to DevMeta, but I didnt..., yet...
PS - I dont use PixelCountMetadata, since I only have originals in Lightroom. All resized copies are kept outside of Lightroom. Consider TreeSync if you regularly keep variously sized copies at the ready for various purposes... And, lastly, ExportManager will help you keep all your trees up2date, if you have more than one.
I then use ACDSee to find photos in the exported copies or run slideshows, or serve on the house net, or email...
R

Ruler and Info panel give different pixel dimensions

The pixel dimensions in Illustrator CS5's Info panel are wrong. Can anyone suggest why?
I have a web layout in Illustrator that I'm transposing into Adobe Muse, using Save for Web and Devices.
I want to use the X and Y coordinates and the dimensions of the objects in Illustrator to place them correctly in Muse, so that all the elements scale to the right size.
The Illustrator artboard is 960 pixels wide and the layout fits the artboard. Similarly, the site width in Muse is 960px wide.
The measuring units are in pixels in Illustrator, but something very strange is going on.
in the Info panel, a grouped object - a logo - is described as 16383 pixels wide and 211px high.
It's simply not possible, not least because the logo is taller than it is wide. But when I measure it with the ruler tool, it tells me that the logo is 136px high and 122px wide.
The problem only applies to this grouped object and it's not because it's grouped with some other thing that is 16383 pixels wide - the bounding box fits precisely round the logo when it is selected.
Can anyone suggest a solution?

Badger,
What happens if you Copy and Paste that Group into a new Document (you may the rest follow if it helps)?

Determining accurate pixel dimensions from screenshots

So, this is a bit of a strange question. Essentially, the company I work for has a large social media presence and is worried about how certain images display on mobile vs desktop. There are a ton of guides out there providing the optimal image sizes, but many lack any mobile image dimensions.
My answer was to take screenshots of each platform to determine the optimal size. However, when I use the marquee tool to measure width and height, my pixel dimensions are very different; especially the ones from my phone.
For example, Facebook says an ideal profile picture is 160 x 160 pixels. I took a screenshot on my Macbook Pro and what I measured was 150 x 150 pixels exactly and my mobile screenshot shows 212 x 212 for the picture.
While the aspect ratio is same (1:1), I'd just like to understand why my monitor screenshots are giving me a different number.; especially because I've been reading that ppi has no bearing on web based images anyway and that 160 pixels should display the same regardless of ppi.
To put it simply, is there a way to accurately determine the sizes of these images via screenshots or am I shooting in the dark for a solution like this?
Thanks in advance!

So, this is a bit of a strange question. Essentially, the company I work for has a large social media presence and is worried about how certain images display on mobile vs desktop. There are a ton of guides out there providing the optimal image sizes, but many lack any mobile image dimensions.
My answer was to take screenshots of each platform to determine the optimal size. However, when I use the marquee tool to measure width and height, my pixel dimensions are very different; especially the ones from my phone.
For example, Facebook says an ideal profile picture is 160 x 160 pixels. I took a screenshot on my Macbook Pro and what I measured was 150 x 150 pixels exactly and my mobile screenshot shows 212 x 212 for the picture.
While the aspect ratio is same (1:1), I'd just like to understand why my monitor screenshots are giving me a different number.; especially because I've been reading that ppi has no bearing on web based images anyway and that 160 pixels should display the same regardless of ppi.
To put it simply, is there a way to accurately determine the sizes of these images via screenshots or am I shooting in the dark for a solution like this?
Thanks in advance!

Pixel dimensions in CS2

Similar Messages

Maybe you are looking for