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

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Specify exact pixel and file size

Hello,
I have recently purchased Photoshop Elements 4.0 for Windows for a company project. I need to compile a number of outdoor photographs to be uploaded to a specific website. The photo specifications required by the website are that all photos must in JPG format, be 350 pixels across and no more than 40kbs in file size. I've been experimenting with photoshop to try and achieve this effect, but am wondering if there is a simple way to accomplish this. I have been able to adjust horizontal pixel number, which automatically adjusts vertical pixel number and photo size. When I save photos, I am able to adjust what I assume is the resolution of the photo. If there is not too much color contrast in the photo, I can sometimes reduce the file size to 40kbs by taking it as low as it will go, but not always. I was just wondering if there is a simple way to make sure that a photo will be saved with a specific pixel number and no more than a certain file size (40kbs). I would greatly appreciate any suggestions.
Brandon

You can also set the pixel dimensions in S4W and save a step. Just enter the size you want in the box about halfway down the right panel, and then click Apply. Then you can optimize the file size by clicking the right-facing arrow at the upper right of the panel and choosing Optimize to file size. You can specify the exact size you want. Just watch the preview to be sure the quality is good enough at the target size.

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.

I need to change my image file size but keep the same pixels. Possible?

I'm trying to upload an image to a mobile ad platform (Adfonic) with the following requirements: Image dimensions 216 x 36 pixels; max file size 3.0 kb; file formats supported GIF, JPG, PNG. I figured out how to change the pixel size but now my file is too big. I have Photoshop CS4 Extended & Vista.
I changed the file resolution but then the pixel size changes. What can I do?
Thanks!

Save-As, JPEG offers you a quality slider. You trade quality for size. This still wouldn't give you what you needed?
You could try JPEG 2000, but beware, it's not as compatible with as many things, and it can look kind of weird, but boy does it compress...
-Noel

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.

Why are the file sizes of exported jpegs so small?

I shoot raw, studio portraits mostly. I import to Lightroom 5 as DNG and then edit. Upon exporting as jpegs, the file sizes end up way too small, some of the cropped and/or black & white conversions as small as 560 KB, even with slider to 100%. Un-cropped color photos are ending up from 1.5 to 3MB. What am I doing wrong?

Jim,
Thank you for your response. I think some of the difficulties in this thread are that there have been more than one person reporting issues, which may or may not be exactly the same or different from the initial one reported by the original poster. Then, anyone else commenting can easily intermix bits and pieces from any or all of the other posters interrelated issues. Also, I should have added to my last response in clarification what I meant about the overall dimensions. I was referring specifically to inches, not file size, not resolution.
My very first post was a thank you to Rusty's post for his comment about how he had noticed his Resolution setting had been changed from ppi to ppcm. I didn't say anything about printing. In fact, I never even stated what my issue was. I was merely thanking him for sharing information. So, for anyone to tell me that I didn't know what my issue is, that I didn't understand was quite laughable to me. And then the other two posters were almost equally ridiculous, who said that since they didn't experience the same conditions as myself and another person, it couldn't be a programming error.
Trust me, I understand explicitly about resolution, image size, dimensions, file size and how they are all interrelated. Resolution is essentially the density of pixels. (And I'm still used to dpi vs ppi, that's how long I've been working with the concept.) I often help other people understand in whichever mode is most comfortable for them to grasp the knowledge of how to know what size image they need/want to capture and print depending on the types of measurements shown on their equipment used and by whomever they might be working with for finish work.
I have a set process, I have set image sizes, I have an action recorded in Photoshop to shrink my images to 24" x 36" and save them in the proper folder with the proper name and another to shrink them to 8" x 12" and place them in the proper folder with the proper name. I am meticulous, so when the first image imported into Photoshop and it was 18.898" x 28.346", un-cropped, I couldn't figure it out. The file size was still just as large, the resolution was still 72, I hadn't changed any settings in Lightroom or Photoshop, the ONLY thing I had done was install an update. It didn't make sense to me that with the pixel dimensions still being the normal size, all of the sudden the inch dimensions were smaller. And I did need to be able to have the capability for a larger print size if/when I do want to print.
I hope that I'm being clear now. I really was just trying to post a thank you initially. I hadn't expected all of this excess.
I apologize for the troll statement. It wasn't meant for you directly, it was more for the grouping of comments which in my opinion didn't seem to be useful for the discussion and were instead just baiting. I shouldn't have allowed my bad mood to permeate my own comment regardless. I am also sorry for any other statements I made which might have come across wrong. I was trying to be funny with my first comment about programmers, but it might not have come across that way. I hadn't expected the rude and unnecessary comment back which I received, and that's where the trollish comments came from. That's why I only responded to that person once, despite the string of poking posts.

Lightroom 4 - presets and file sizes

When i apply a preset to a photo, then export it ... the file i end up with is significanatly smaller than my original file ? These same presets resulted in as large / or in most cases larger files sizes in previous versions of lightroom ...

Develop Module Presets have almost nothing to do with file size.
File Size is a function of Pixel Dimensions, File Format and Compression (if any)
I suspect you are exporting them with different settings than you were in previous versions of Lightroom.
What is the file format to which you are exporting? What are the settings for File Type, Quality, Compressoin? What are your Dimensions? How do these settings in Export differ from your previous exporting?

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?

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

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 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?

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.

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.

Pixel dimensions / file size

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