Pixel dimensions & document size

Why do the pixel dimensions change the document size when the "resample image
" box is selected? I want the pixel size to be 2400 x 3000 and the image size to be 8 x 10in.
Any ideas why I can't change the pixel dimensions without the system changing my document size to something other than the 8x10 that I want? Thanks!

Why do the pixel dimensions change the document size when the "resample image
" box is selected?
Because that's exactly what "resample image" means.
I want the pixel size to be 2400 x 3000 and the image size to be 8 x 10in.Any ideas why I can't change the pixel dimensions without the system changing my document size to something other than the 8x10 that I want?
Probably because your document is not 8x10 aspect ratio to begin with. If the photo is not 8x10 aspect ratio, then resize will not get you there (unless you want to distort your photo). You must first crop your image to 8x10 aspect ratio, and then if necessary resize.

Similar Messages

Pixel dimensions / file size

I am trying to publish a photo to a website with specific limits for pictures. How can I adjust pixel dimensions and file size using iphoto?

Hi wrigjef: Try this: iPhoto open, select the picture(s) you wish to work with, from the "File" menu, select Export. The resultant dialog box will give you several options for pixel dimension, file size etc. After files have been saved to the specified location they can be then up-loaded to the website.
Hope this helps
Stedman

Pixels and document size differences in Illustrator compared to Photoshop

Why is the pixel ratio of a project in illustrator different than that of the same pixel ratio of a project in Photoshop? Example: A project can in Illustrator can have an artboard of 950px X 950px and be 12in and in Photoshop that same pixel ratio will be 4 3/4in.

The rulers in Illustrator are always with fixed ratio of 1 inch = 72 pixels (72 ppi), you can check this by right clicking on the ruler and choosing inches or pixels and you will see that 950 px will be 13.9 inches and not 12 inches as you stated.
The ratio of the rulers in Photoshop depends on the ppi resolution of the image set by the user in the Image Size dialog box. If choose Image > Image size, and set the Resolution to 72 pixels/inch (ppi) then the ratio of the rulers in Photoshop will match Illustrator. If you set it to something else they will not, in your case with an image with sides of 4.75 inches in Photoshop the Resolution will be 200 ppi in order to contain 950 pixels per side.
When you save an image from Photoshop that contains metadata it has information about the size of the document in inches and pixels. Illustrator will place such images with the size of the inches not the pixels as indicated on the Illustrator rulers, internally however the image will contain all the pixels as indicated next to the PPI on the Control bar under the main menu when image is selected. These internal (actual) image pixels will be used when printing and when zooming on screen to render the image. Also if you copy from Photoshop and paste in Illustrator, it also will paste with the size of the inches and not the pixels (at least this is how it works with CS5 on Windows)
If the placed image is without metadata Illustrator will always place it assuming 72 px = 1 inch (72 ppi). You can check that if in Photoshop save an image using Save for Web and Devices and choose None for Metadata.

Cropping and Post-Document Size

Hi,
I need to crop my images at 500x500 pixels for a project. I do a Save For Web & Devices and use JPEG, optimize at 80%. When I open up the new JPEG file, the pixel size says 500x500, but the document size says 6.944x6.944 inches at 72 resoultion, instead of 5x5 inches at 100 resolution. I've been doing the same process for months and it was correct in pixel and document size until recently, but I haven't changed any settings or my process. Does anyone know why this is happening?
Thank you,
Jennifer

Thanks, that all makes sense. I'm just curious though, why would Photoshop display the document size differently, one as 5"x5" at 100ppi (files I did months ago) and then recently it seems to have just decided that it wanted to display the document size at the 6.944"x6.944" at 72ppi? We've always done a "Save for Web" and not "Save As." Other than that, thank you for your responses, I understand.

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?

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.

Reducing pixel dimensions increases document size.

In photoshop cs6. Working on an image of 15000x18662 pixels, with about 100+ layers. doc size 800mb/6.43GB. To optimize speed, I reduced the file size to the absolute minimum I need which is 13200x16423. However now the file size grew bigger 620.2M/6.45GB. Some layers extend beyond the visible image area, so I cropped the image "deleting cropped pixels" , but this increased the image even further to 6.50GB. What's going on here?
Why is the file size increasing when I decrease pixel size?
Why would deleting cropped pixels increase file size?

This is a user to user Forum.
If no one who has bothered to read the original post considers it of enough interest to investigate or advise that is up to them.
Can you provide the original image?
Depending on the interpolation settings on the content downsampling might result in a lessened effect of the applied compression.
You seem to give the approximated values from "Document Sizes" in the status bar – what is the actual file’s size?
Quote from the Reference:
Document Sizes Displays information on the amount of data in the image. The number on the left represents the printing size of the image
—approximately the size of the saved, flattened file in Adobe Photoshop format. The number on the right indicates the file’s approximate
size including layers and channels.

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 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.

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

Pixel Dimensions and File Size

Can anybody please explain the relation between pixel dimensions and file size?
Being naive, (or straight-forward if you prefer) I had assumed that pixel dimensions wide times pix dimension high = file size. Wrong!
For instance a .JPG file 374 X 500 has a file size of 41,275 bytes. But 374 times 500 = 18,700 so the two are different issues.

Thanks Rich. It kind of sounds like you know something about this.
I see 1 pixel, and 24 bit color would make 24 bits at 8 bits to a byte, so there's the 3 bytes.
I selected a certain photo and used the APPLE i command to see if could find if it had 8 bit color or, whatever. That infomation was not on the info function, but it did say something about RGB color profile.
Is 8 bit color a near certain bet in most applications, or was that just for the sake of illustration?
I Googled 8 bit color and go to a Wikipedia Article
http://en.wikipedia.org/wiki/Color_depth
which explained a lot, but its more technical depth than what I'm prepared to deal with. The net net, as far as I can tell is that image size (before compression) is dimension times color depth in its native mode, but I suppose what the native mode is and what the displayed mode is could be separate issues?
I was under the impression that the compression in JPG formt files comes out, or is decompressed, when the photo is printed or displayed? No?

When I export photos from Aperture, the pixel dimensions are halved thus losing data. I have set the export preferences to export at original size, to no avail. This happens even if I just drag to the desktop and then back, or if I export into my iphoto

When I export photos from Aperture to desktop or iphoto I lose pixels. The pixel dimensions are halved, despite setting the export preference to export at original size. Anyone know why or how to correct this?

Dragging an Image from Aperture exports the Preview. Preview parameters are set on the Previews tab of Aperture preferences.
Are you seeing the same results when you export using one of the export commands?
Is so, confirm that the settings in the selected Image Export Preset ("Aperture➞Presets➞Image Export") truly represent those in the Image Export Preset's name.
HTH,
--Kirby.

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.

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.

Resize a layer to a percentage of the document size and position in corner

I need to create a script that places a logo in the corner of my main document but i need the logo to be constrained to a percentage of the document size. my logos needs to live in the bottom right corner of my images and be no larger than 28 percent height and no larger than 60 percent of the width of the document. i need it to constrain proportions of the original file so if the logo is square it will remain square, or if it is more rectangular it will maintain its rectangular shape. Heres what i've come up with so far, i am pretty inept at scripting so if disregarding my current script is more helpful than building upon it please ignore mine:
if ( documents.length > 0 )
    var originalDialogMode = app.displayDialogs;
    app.displayDialogs = DialogModes.ERROR;
    var originalRulerUnits = preferences.rulerUnits;
    preferences.rulerUnits = Units.PIXELS;
    try
        app.activeDocument = app.documents[0];    //set active document to 2nd document
        var docRefOne = app.documents[0];
        var refWidth = docRefOne.width;
        var refHeight = docRefOne.height;
        app.activeDocument = app.documents[1];    //set active document to 2nd document
         var docRef = activeDocument;
        //current image dimensions
        var w = docRef.width;
        var h = docRef.height;
        activeDocument.selection.selectAll();
        docRef.selection.copy();   //Copy selection
        app.activeDocument = app.documents[0]; //set first document as active document
        var docRef = activeDocument;
        activeDocument.selection.selectAll();
       docRef.paste(true); //paste into selection
    catch( e )
    // An error occurred. Restore ruler units, then propagate the error back
        // to the user
        preferences.rulerUnits = originalRulerUnits;
       app.displayDialogs = originalDialogMode;
        throw e;
    // Everything went Ok. Restore ruler units
    preferences.rulerUnits = originalRulerUnits;
    app.displayDialogs = originalDialogMode;

You could do something like this...
#target photoshop
activeDocument.suspendHistory('Logo Resize', 'main()');
function main(){
if(!documents.length) return;
var startRulerUnits = app.preferences.rulerUnits;
app.preferences.rulerUnits = Units.PIXELS;
var myDoc = activeDocument;
/////////////////////////////// Amend to suit /////////////////////////////////
var Opacity = 100; /* Opacity of logo */
//Position logo   X,Y
var X = myDoc.width - 10; //Right side of logo
var Y = myDoc.height - 10; //Bottom of logo
var Logo = File(Folder.desktop + "/logo.png"); //logo
if(!Logo.exists){
    alert("Your logo '" + decodeURI(Logo.name) + "' does not exist!");
    app.preferences.rulerUnits = startRulerUnits;
    return;
placeFile(Logo);
var LB = myDoc.activeLayer.bounds;
var docHeight = myDoc.height;
var docWidth = myDoc.width;
var LHeight = Math.abs(LB[3].value) - Math.abs(LB[1].value);
var LWidth = Math.abs(LB[2].value) - Math.abs(LB[0].value);
if(LWidth > LHeight) {//Landscape logo
var Percent = 60; /* Resize logo to percentage of smallest side of doc */
if(LWidth < LHeight) {//Portrait logo
var Percent = 28; /* Resize logo to percentage of smallest side of doc */
if(LWidth == LHeight) {//Square logo
var Percent = 15; /* Resize logo to percentage of smallest side of doc */
var percentageHeight = ((docHeight/LWidth)*Percent);
var percentageWidth = ((docWidth/LWidth)*Percent);
if(docWidth < docHeight){
myDoc.activeLayer.resize(percentageWidth,percentageWidth,AnchorPosition.MIDDLECENTER);
}else{
myDoc.activeLayer.resize(percentageHeight,percentageHeight,AnchorPosition.MIDDLECENTER);
var LB = myDoc.activeLayer.bounds;
X = X - LB[2].value;
Y = Y - LB[3].value;
activeDocument.activeLayer.translate(X,Y);
activeDocument.activeLayer.opacity=Opacity;
app.preferences.rulerUnits = startRulerUnits;
function placeFile(placeFile) {
var desc = new ActionDescriptor();
desc.putPath( charIDToTypeID('null'), new File(placeFile) );
desc.putEnumerated( charIDToTypeID('FTcs'), charIDToTypeID('QCSt'), charIDToTypeID('Qcsa') );
var desc2 = new ActionDescriptor();
desc2.putUnitDouble( charIDToTypeID('Hrzn'), charIDToTypeID('#Pxl'), 0.000000 );
desc2.putUnitDouble( charIDToTypeID('Vrtc'), charIDToTypeID('#Pxl'), 0.000000 );
desc.putObject( charIDToTypeID('Ofst'), charIDToTypeID('Ofst'), desc2 );
try{
executeAction( charIDToTypeID('Plc '), desc, DialogModes.NO );
}catch(e){}

Pixel dimensions & document size

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