Resizing images through dpi or WxH dimension

I edit pictures but it seems no significant difference between changing dpi or not. In naked eye, it's almost the same!
My question: What is the difference when the image size changes via dpi resolution rather than changing the WxH simply ignoring dpi?
Can anyone explain me which one is best? Thanks in advance.
Note: If I choose first to dpi, it's usually followed by changing the WxH that must be corrected.

Yes if you do not resample not a single pixel is changed. The number of pixels remain the same as does the File size and image aspect ratio. All that changes is the size of a pixel the resolution the pixel density the dpi. Pixels have no size till you specify the resolution. 300dpi means that there are 9000 pixel per square inch each is square 1/300"x1/300" when the resolution is 100DPI there are 1000 pixels per inch each is 1/100"x1/100" the 100DPI image is 9 times larger then the 300DPI image it is 3 times wider and 3 times higher.
When you resample an image not a single pixel remains intact. You wind up with an entirely new image with a different number of pixels so the file size will go up or down depending on the how you resample. Not a single pixel was made using a lens, sensor and firmware. If you do not constrain the aspect ratio during the resampling the image will also distort. When you resample you will always loose some image quality. A print image of the new generated image the number of pixel and resolution may look better close up then the original image still the detail was not captured from the scene. It was generated from some other image by a computer algorithm. Or the number of pixels may have just been reduced so it will fix on a web page, Web page image display at the display devices dpi resolution, The Image dpi is not used for displays are run at a single resolution. Web image display size depends on the display. On a high resolution display the image will be smaller then on a low resolution display.

Similar Messages

Need help on quality of resized image!!

I am required to resize images to max 1240pixel (longest dimension) as a submission of work, though when work is viewed it will be at 30"x40". Can not figure out a way to do this where images don't become quite pixelated when viewed at larger size. Appreciate any suggestions.

Is there some software to verify if my graphics card is shotty?
Techtool Pro has some testing, the AHT tests VRAM, but game benchmarks and stressing will tell you the most.
Is re-seating the graphics card or memory worth trying?
Absolutely. Just don't reinstall the graphics card until you clean it thoroughly.
Cleaning the dust out of my machine?
YES. A dust filled graphics card heatsink will cause the GPU to cook, and cause problems thet you describe.
If I need a new graphics card, what are my options? Do I have to purchase it via Apple store? I would like to stick with an Nvidia card so am I stuck buying the same card I currently have or can I upgrade?
You don't have to buy from Apple, but using with OS X limits your choices to Mac compatible or flashable PC versions.
There is an awful lot of user input into this topic here:
http://blog.macsales.com/602-testing-those-new-graphics-cards
Card reviews can also help:
http://www.anandtech.com/video/showdoc.aspx?i=3140&p=9
http://www.tomshardware.com/reviews/radeon-hd-4870,1964.html

Cannot Resize Images in Elements 8

Hi,
I recently had my laptop stolen and I had to reinstall in Elements 8 on my new computer. Since then, I have unable to resize images. I go to Image -> Resize -> Image Size and the pixel dimensions box is grayed out and I am unable to change the pixel dimensions. The document size function works fine and is not grayed out.
It's very odd and frustrating. Perhaps a simple fix, but I am totally stumped.
Thank you for any assistance you can give.

In order to change the pixel dimensions you must first turn on the Resample Image checkbox, since shedding or adding pixels necessarily involves resampling. Try it with that turned on.

Cropping/resizing image by pixel dimensions

I am trying to crop or resize an image that is originally 2,122 x 1,415 px | 7.1 x 4.7 in | 300 dpi. I am to crop/resize image to fit 756 x 275 px. However, I don't want to lose the whole image. I would like to use the whole image just adjust it to the dimensions.
How can I accomplish this without creating any distortion or by removing elements by cropping the image?

Hello Slange,
may I propose a solution based on a more mathematical derivation, where I assume the height of 275 px is decisive. The way is the same, if the 765 px width is important.
The reduced copy of 2122 x 1415 provides 412 x 275. To the wished 756 you need: 756 - 412 = 344. Splitting it into two parts I'll get 344 : 2 = 172. These I mount now (The black borders are only for better overview.) to an image with the wished measures 756 x 275:
The white area you can fill it with any suitable color.
Hans-Günter

We have version 10.5.8 photoshop CS3 for Mac. How do we fix a problem with photoshop not resizing dpi? For example we resized a 72 dpi image to 200 dpi, when we do a pdf analysis it read as 344 dpi.

We have version 10.5.8 photoshop CS3 for Mac. How do we fix a problem with photoshop not resizing dpi? For example we resized a 72 dpi image to 200 dpi, when we do a pdf analysis it read as 344 dpi.

Sounds like it's a problem with the Acrobat settings. Did you set them to the same resolution?

Resizing images published through flickr, but I don't want it to.

I set up a flickr connection with LR3, very cool. However it resized the image to 1024x768, though I have nothing set under 'resize'. Why is it doing that? Do I have to set it to resize everything to 9000 pix and not enlarge for it to keep the original size?

Setting the resolution to 9000 x 9000 wont make any difference. Or at least it did not for me.
It could be a limitation of Flickr (no Pro account). Perhaps it is different with a Pro account.size file is being uploaded if you dont resize on output but you wont see it if you dont have a Pro account.
In fact, from the Flickr site: Only smaller (resized) images accessible (though the originals are saved in case you upgrade later)
This would suggest that your original size file is being uploaded if you dont resize on output but you wont see it if you dont have a Pro account.

Cannot resize images after CS5 and CC updates

I recently installed Photoshop CC and the CC app recently updated both my own CS6 and CC. I find that I now cannot resize images using the "image size" dialog. Any changes I try to make in dimension or resolution are ignored. Has anyone else encountered this problem, or does anyone have any info which will help me discover what I am doing wrong? Before, I simply entered the resolution and size I wanted for the image. Now I cannot .I have tried suggestion here: e.g., deleting pixels when cropping, etc., but nothing seems to work for me.

Thank you, Mylenium. Just curious... the CS5 update was done before I had
the CC app. Some CS6 updates were done before I joined the CC (the CS5 in
my problem subject-line was a type--should have been CS6), and one through
the cloud. CC, of course, was all updated through the cloud. Am I to
understand that CC would have done something to my owned, personal version
of CS5, which has the same problem?
Not an auspicious beginning with the cloud if complete
uninstalls/reinstalls are necessary right off the bat. I wonder how often
this type of problem will occur using the cloud, which obviously now
monitors my personal version of CS6, as well.
isabelle ann

Why do my resized images print out original size?

i understand how to resize images (somewhat). however, when i print them, they are printing as original size. what do i have to do to correct this? i have searched the web in vain, am just not finding info. everything is about resizing only. i am using picture manager. have also tried with paint and photo gallery or something. no one in this house is very computer saavy, PLEASE HELP!!!

Thankyou for your response! Still in need of help!
          I am making a craft project. I have resized my image exactly how i want it to be to fit my project base. (No standard sizes work). I made the image smaller, to fit exactly on my base (a heart). I saw there were even templates with a heart, but have not figured that out yet. I used the percentage button to resize my image, with the ratio set to keep the dimensions correct. I saved the resized image. Then I opened it and printed it. It was smaller, but still not right, not how I have it on the screen and not the right size. It is too big for my heart and wouldn't work. I know it must be something simple, some little step I am missing. I need to know how to tell the printer the new size. I am using picture manager. I have a HP Photosmart Plus B210 series printer. I have picture manager, paint, hp photo viewer, windows photo viewer, media center, photo gallery. I don't understand why resizing, saving, then opening that file, still did not work. It still printed out (smaller than original but) not the size I needed. I also edited the image and saved it with a new size, and my editing changes.
       This is truly driving me insane! I have spent hours and hours trying to figure it out for myself, as well as searching the web, and asking for help from different forums. (Not to mention wasting lots of ink!??!!!!)
                                                     I Truly would appreciate any help,
                                                                      SINCERELY,
                                                                      lamblovegirl

Does anyone resize images to fit InDesign Rectangle Frame tool?

My question is based on some booklets that we have created in the past. We have some very large images all 300 ppi, but when shrunk down they tend to have an effective ppi of 500 or greater. Part of me feels that when the effective dpi is large, that I should go back into photoshop and resize those images, hopefully saving the size of the PDF file after exporting. So, my questions are one, does anyone even resize images anymore to fit the rectangle frame to keep ppi around 300 or two, do they not do this anymore and let InDesign handle this process when exporting to PDF?
Thanks Everyone,
Mike

Better quality is to resize in Photoshop and sharpen there, because InDesign has no choice of the method of sharpening. But to be honest, in the majority o cases I do resampling in InDesign when exporting to PDF.

Resizing images - portrait and landscape

Hi,
I am uploading and resizing images(see code), I want to
resize them to 200px by 150px if landscape and 150px by 200px if
portrait. How can I determine the orientation of the image?

Well, first of all you would need to know what the initial
image dimensions are. And the way to do this is to get the current
images height and width from reading the image. You would then
compare the width number to the height number and if the width is
greater than the height, you know that it's more of a landscape
photo...and vice versa.
Try this code:
<cfimage action="read"
source="#expandPath("graphics/corner.png")#" name="myImage" />
<cfdump var="#variables.myImage#" />
<cfif variables.myImage.width gt
variables.myImage.height>
Landscape
<cfelseif variables.myImage.width lt
variables.myImage.height>
Portrait
<cfelseif variables.myImage.width eq
variables.myImage.height>
Square
<cfelse>
Something else for whatever reason.
</cfif>
At least, I think this is how you'd do it. I know it's not
the most elegant way...you might want to look at ColdFusion image
functions rather than reading the whole image in, I think there are
functions just to get width and height, which I imagine should give
you better performance.
Good luck,
Mikey.

Safari resizing images, again...

Some years back, around 2007, I started a thread about Safari automatically resizing images that are larger than the window. That "feature" magically appeared with one Safari update, and quickly disappeared with another update. Well, it's now July 2011 and a new Safari update Version 5.1 (6534.50) has brought this annoying feature back.
I'm sure there is no way to disable it. I have looked through the preferences, developer and debug options. Why can't Apple make up their minds or at least give us the option to turn this thing on or off!!!!
Check to see if Safari is resizing with this image: http://img51.imageshack.us/img51/9117/g9img0272sj.jpg
If it fits within the window and your cursor shows a zoom icon with a plus Safari is resizing. Those of you with high resolution screens may not experience resizing as most images will fit within your window.
You can also tell if Safari is resizing images by grabbing the bottom right window resize handle and resizing Safari. You'll notice the image will change size to fit within the window. See this pic for an example: http://img585.imageshack.us/img585/3074/screenshot20110722.jpg
Mark
This is under 10.6.8 Snow Leopard, not 10.7 Lion, although I would expect the same behavior with both.

Firefox will auto resize images, but not text files.
Safari will auto resize text files, but not images.
I'd love to turn auto resize for images on and off in Safari.
Does anyone know how to do this, with a style sheet perhaps?

My iPad will not resize images for the wallpaper

My iPad will not resize images for the wallpaper

if you go in through the photos app and send your image to be wallpaper you'll have a bit more luck.
Also, go into the settings, accessibility and try turning off parallax motion.

I'm too bad in math! can't figure the correct function to resize images

This is driving me crazy, just becasue I don't have the
logical brains it takes:
I want to dynamically (PHP) resize images, according to a max
width and max height parameters.
What's giving me a problem is that max width and max height
are not equal, AND the images should be
resized only if their original size is too big:
$max_width = 650;
$max_height = 500;
$size = getimagesize($image);
$img_width = $size[0];
$img_height = $size[1];
Now how do I write a function that will resize images of any
possible size, *only if they need to*,
to fit in the maximum size *rectangle*?...
I have tried for hours to get it right, and I am ending up
with a function so full of conditionals
and sub-sub-conditionals that I'm getting completely lost.
I hope you can help, I'm sure it should be very simple...
seb ( [email protected])
http://webtrans1.com | high-end web
design
Downloads: Slide Show, Directory Browser, Mailing List

here's the solution. This will correctly and proportionally
reduce image size according to ANY max
width and max height, no matter what the difference between
max width and max height:
if(($width <= $max_width) && ($height <=
$max_height)){
// The image is the right size already
$targetwidth = $width;
$targetheight = $height;
}else{
// if width > height
if($width >= $height){ // if height > width
$targetwidth = $max_width;
$targetheight = $targetwidth * ($height / $width);
// here we must check again if reduced height is not still
greater than max_height
if($targetheight > $max_height){
$targetheight = $max_height;
$targetwidth = $targetheight * ($width / $height);
}elseif($height > $width){ // if height > width
$targetheight = $max_height;
$targetwidth = $targetheight * ($width / $height);
// here we must check again if reduced width is not still
greater than max_width
if($targetwidth > $max_width){
$targetwidth = $max_width;
$targetheight = $targetwidth * ($height / $width);
(_seb_) wrote:
> Actually I did some tests, and it does not work!
>
> Here's the problem:
>
> $maxwidth = 600;
> $maxheight = 400; // max height is smaller than max
width!
>
> Then the method tests whether the image is taller or
wider, and resizes
> it to maxwidth or maxheight accordingly.
> So, if an image is 700px wide and 699px high, it will be
reduced
> according to $max_width, because the image is wider than
tall.
>
> *The resulting resized image will be taller than
$max_height*.
>
> That's the problem I have been running into.
>
> I cannot find a simple mathematic solution, without
getting lost in
> endless conditionals. I have found many examples of
resizing according
> to max width and max height parameters, but not one that
addresses this
> issue.
>
> (_seb_) wrote:
>> thanks Sonjey - that worked
>>
>> Sonjay wrote:
>>> This is the basic code that I've used on several
sites. It checks to
>>> see if
>>> the image needs to be resized, and if so, it
does the math to figure
>>> out the
>>> new proportional dimensions, whether you need to
resize to a
>>> specified width
>>> or to a specified height.
>>> $size = getimagesize($file);
>>> // Specify desired maximum dimensions
>>> $maxwidth = 650;
>>> $maxheight = 500;
>>> if ( ($size[0] <= $maxwidth) &&
($size[1] <= $maxheight) ) {
>>> // The image is the right size already
>>> $targetwidth = $size[0];
>>> $targetheight = $size[1];
>>> } else {
>>> // if width > height
>>> if ( $size[0] >= $size[1] ) { // if height
> width
>>> $targetwidth = $maxwidth;
>>> $targetheight = $targetwidth * ($size[1] /
$size[0]);
>>> } elseif ($size[1] > $size[0]) { // if height
> width
>>> $targetheight = $maxheight;
>>> $targetwidth = $targetheight * ($size[0] /
$size[1]);
>>> }
>>> } // END ELSE
>>>
>>> Now you have your target width and target height
set proportionally,
>>> and you
>>> can proceed with your resizing operation, using
$targetwidth and
>>> $targetheight.
>>>
>>
>>
>
>
seb ( [email protected])
http://webtrans1.com | high-end web
design
Downloads: Slide Show, Directory Browser, Mailing List

Resizing Images for Websites

I am creating a website for a Family Farm. I was wondering if there is any good way to resize images using iPhoto for quicker loading times in websites. Most of the images I want to use are from a digital camera and are huge files.

Welcome to the Apple Discussions. As Dalya mentioned using the File->Export->File Export menu option will let you set the pixel dimension and quality level (amount of jpeg compression) to achieve small files for web use.
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.

Resizing images without export

Hi all,
I would like to create a folder that contains re-sized versions of my master images. The folder will be photos that I am posting to my web site and I want to be able to control their size and keep this resized image in my aperture library. I am uploading them through the site host's uploader (squarespace) using finder, not exporting through aperture. Is there a way to create duplicate,resized versions of the images without exporting and re-importing the photos?
I know that aperture isn't photo editing software, but i expected that it would be able to do basic things (mirror, resize, etc) and am constantly disappointed. I could round-trip to photoshop, but I hope there's an easier solution.
Thanks,
John

First question - why do you need the JPEGs? If it's to upload them to a site via FTP there are export plug-ins to do this directly from within Aperture.
Using the media browser isn't going to help you at all because that will be accessing Previews in Adobe98 profile - not something you should be putting up on a website.
I also came across this problem when I wanted to convert a large number of raw files to jpegs and keep the new jpegs in my library. At the time I was running low on disk space and didn't need the raws anymore, but had to go through the process of exporting and re-importing for a bunch of projects.
Sorry, but that's a bit too alien an idea for me - I never threw away negatives back when I was using film, why would you throw away RAW files now?
Another pet peeve I have is that there is no status indicator when exporting (2 minutes left, 25% done, etc....anything besides a beachball), so I don't know how long the export will take, and on my 2006 macbook it sometimes takes a while.
At the bottom of the Browser pane on the left you will see a progress 'swirl' when exporting, importing or generating Previews. Click on it to bring up the activity window with progress bars for all current actions. You can also access it through Window>Show Activity.
Ian

Resizing images through dpi or WxH dimension

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