rb61 Loc: Maple Grove, MN

When I select edit/resize, the numbers seem to be 3x my sensor's file size (16MP). Is it adding r+g+b?
If so, how is this value useful?
Thanks

bleirer

That is interesting. You do have resample unchecked so that could mean something. Found this article but it doesn't really explain your question. https://helpx.adobe.com/cy_en/photoshop/using/image-size-resolution.html

SonyA580 Loc: FL in the winter & MN in the summer

This article may help you understand what you are seeing: https://www.photoshopessentials.com/essentials/image-resolution/. From what I can gather, the "Pixel Dimensions" is the file size with EXIF data, etc., added in. I see that if I go from my RAW processor to Photoshop as a .tiff I will get a MUCH larger file than if I go with a .jpg. The numbers are far greater than the megapixel rating of your camera's sensor.

rb61 Loc: Maple Grove, MN

Thanks for responding. I was somewhat surprised that after 60 views, no one had an answer. Upon looking at my original post, I fear that I may not have explained the situation clearly.

The 40Mp file size appears on the resize window and on the bottom left of the image window. The yellow highlighting was done by Adobe and is not part of my question other than when the height and width numbers are calculated the result is approximately 16Mp (sensor capability).

I experimented with your observation, but no matter what combination of selected boxes, there was no change.

Thanks again

russelray Loc: La Mesa CA

It's about 3x your sensor's file size because your resolution is set to 350 pixels/inch.

Files that come off of my Canon 760D arrive in Photoshop at 72 pixels/inch at 6000 x 4000. For printing, I increase that to 100 pixels/inch. The file size goes up by 100/72. For book printing, I increase to 300 pixels/inch. The file size goes up by 300/72.

SuperflyTNT Loc: Manassas VA

You’re conflating megapixels and megabytes. Two different things. MP is how many pixels make up an image. Megabytes is how much space it takes to store the image, which depends on other factors along with the number of pixels.

bleirer

That seems right, it's confusing that they call it pixel dimensions in the box though.

rb61 Loc: Maple Grove, MN

Thank you. I am humbled. I used to know better way back when my brain was more flexible.

frankraney Loc: Clovis, Ca.

The screen you're showing is print (image) size. At 350 pixels per inch it will make your print that size in inches( since you have inches selected). This has nothing to do with file size on a disc. If you change the 350 to 300 then the 45 will drop down, that's pixels-per-inch or megapixels in the print.

lamiaceae Loc: San Luis Obispo County, CA

I have not read thru the answers all yet to see if any make sense or are correct. But, right off Computer files sizes are measured in bytes, likely megabytes for files coming from a digital camera. For some reason Adobe has always been fast and loose with how they use the terms MB, MP, especially ppi, and dpi. Look at your files with Windows or Mac, do they seem odd or ok then from before to after? I've always found that an open file in Ps seems much larger than what the computer's OS says it really is. Also remember about bit depth. Your camera is likely 14-bit RAW. But think, say for a 8-bit JPG that is actually as RGB color 8x8x8. And for say your working 16-bit PSD or TIF file 16x16x16 a lot of data per pixel bytes. Probably not the best explanation. But something to consider when you frame your question. Similarly and possibly more closely related in my own observation that the RAW files from my 14MP are approximately 18MB in size from the camera. But this can also be algorithm and camera specific. My same brand but newer camera has 16MP capabilities yet is more efficient and makes 16MB files. My yet newer 24MP makes 28MB files. The file MB very actually for every image. It depends on what is there. Any help?

lamiaceae Loc: San Luis Obispo County, CA

What you are saying about your camera and computer is correct. My Pentax Raw files are also 72 pixels/inch but I never work with that as I have ACR set to make 16-bit files at 300ppi. Not sure if that totally explains the OP'ers Q as he does seem to be confusing MP with MB as well. And Adobe themselves can't seem to keep ppi and bpi straight. No wonder people get confused!

SuperflyTNT Loc: Manassas VA

Wrong. The size of the file is the size of the file. If you change the pixels per inch it will change the print size accordingly, same way that if you change the print size it will change the pixels per inch. The total number of pixels does not change. When you send the data to print you're sending a file and that is the file size.

frankraney Loc: Clovis, Ca.

Excuse me, but he showed the print screen, and the measurements in that window are for the print size not file size. Go back and look at his question with that screen and then read my answer again you basically said the same thing I did, I'm not wrong.

bleirer

The OP said it was the image size screen under the edit menu in the original post.

SuperflyTNT Loc: Manassas VA

He was talking about the size under Pixel Dimensions. That has nothing to do with the document dimensions. The print dimensions have nothing to do with file size.