how resize photo to an exact pixel by pixel size?

iPhoto - select a photo ==> edit ==> crop

Cropping does not resize - it removes unwanted portions leaving a "better" composed photo and it can be constrained to a cropping ratio - if you want a specific size photo you crop it to the ratio you want (and using the pixel dimensions of the final photo for the ratio is the easiest) and then you export it with the largest side being the size you want the finished photo to be - since the photo is cropped to the ratio you want, the small side will be the size you want too -- which was the OP requested - to export a specific sized photo

I need to save a photo that is 3872 pixels by 2592 pixels to an new, exact dimension of 475 pixels by 265 pixels.

crop the photo to 475 x 265 and then export it with the largest dimension as 475

LN

LarryHN wrote:
No - cropping is not to dimensions but to ratios - you could crop to 475x265 or 4750x2650 or 1425x795 or 95x53 with exactly the same results

OK which cropping tool or area in iPhoto you are looking at? I just checked it and cropping CROPS it doesn't resize.
Patrick

Except that the original poster (OP) probably wants to resize (not crop) it down to 475 wide then trim (crop) the height to 265. If you simply CROP to 475x265 then you are only seeing a tiny portion of the photo rather than a resized & then trimmed version. Right?

Patrick


No - cropping is not to dimensions but to ratios - you could crop to 475x265 or 4750x2650 or 1425x795 or 95x53 with exactly the same results - I just recommend using the desired final dimensions as the ratio to avoid having an additional math step and to assure that the crop is exactly what the OP wants

While there are other way to accomplish the task the easiest and most fool proof is to crop to 475x265 and then export with the larger dimension as 475 - the result will be exactly what the OP wanted cropped exactly as they want it

LN

We are getting recursive

Patrick
No - cropping is not to dimensions but to ratios - you could crop to 475x265 or 4750x2650 or 1425x795 or 95x53 with exactly the same results - I just recommend using the desired final dimensions as the ratio to avoid having an additional math step and to assure that the crop is exactly what the OP wants

While there are other way to accomplish the task the easiest and most fool proof is to crop to 475x265 and then export with the larger dimension as 475 - the result will be exactly what the OP wanted cropped exactly as they want it

The crop sets the ratio of width to height, not the size in any way - the export then sets the size but does not affect the proportions (ratio) of the photo

LN

Huuuuuummmmmmmm

I have never seen the "hard" crop option - I have only seen it work as a ratio - and since it always comes up the way you left it, mine always comes up as a ratio - time to go back to school 😟

LN

Message was edited by: LarryHN

Ok - being new to this - and wanting to post some photos on my web site that the web person says needs to be 70dpi(?) or 300x300 - would I do the crop and change the custom setting to 300x300? Then save the photo to the desktop and upload from there?

70 dpi is meaningless - Dots per inch (DPI) had no meaning in a digital photo - click here to read +The Myth of DPI+ - it only has meaning when you display the photos and then is determined by the "inches" that you are displaying divided into the dots (pixels)

In iPhoto (using the default ratio cropping) select the photo, click edit, click crop and set the crop ratio to 300x300 and crop the photo as you want it - apply the crop and then select the newly cropped photo and export it - file menu ==> export using a custom size with the maximum dimension 300 pixels

Send the exported photo to your friend

LN

Cropping has two modes - cropping to a ratio and cropping to a specific set of dimensions - I've not found documentation on this but you seem to control it via un-checking the crop constraint box

See PT's discussion of this reproduced below

Pick a photo and go into edit. Hit the crop button. Normally you get a slight downsized window with the constraint button UNchecked. If yours comes up checked, UNcheck it now (more on that in a minute). Now use the pull down to pick Custom the constraint button then checks and you get default values of zero in the two boxes. At this point if you then pick dimensions, such as 475 x 265, you are picking a RATIO box that stretches all the way across the longest size of the photo and the other dimension determined by the ratio. This is what you were talking about.

However, pick crop and this time start with the constraint button CHECKED. Now use the pull down and pick Custom. Instead of giving you the boxes with zeros in them, this time they start with the full size of the photo prefilled in. Now change the dimensions to 475 x 265 and this time it is an actual hard crop to 475 x 265 pixels rather than a ratio. This is what I saw when I did it and why I didn't understand your comment.

The confusing thing is that depending on how you last left the constraint check box in crop, it will come up that way next time you use crop even on a different photo. So when you go to custom again, it might act differently depending if you entered that setting with the constraint box checked or unchecked.

So anyway, add that to your list of answers for posters. The Crop function in the edit mode has two options, one is a hard crop to set pixels and the other is a ratio crop. How you pick which one is by the checkbox for Constraint before you pick the Custom crop pull down.

LN

I found a program that works well, and its free

http://izoom.us/

You can drag and drop photos in there, even if they are huge dimensions as described. There is a simple slider bar that lets you resize the photo on the fly by dragging it, then you type in the dimensions you want and drag the photo into your little box you have created, cropped, exports as jpeg, flawless.

Amphora

Welcome to the Apple user to user assistance forums

crop the photo to 475 x 265 and then export it with the largest dimension as 475

LN

I tried this... when I select "Custom", the constrain check box self selects... and I end up with the "hard crop" not a resizing of the pixels dims of the photo