Lightroom: Why are images at 300DPI a different size when viewing on the web?

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Hey guys, i got an issue with the size of the pictures that i edit... After the editing, the picture has to be 1281w x 1920h and reso 300. I change the size but when i upload to the website, the size is different. I tried the same thing with camera raw and lightroom. Same results... Any suggestion?
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Constantine McFin

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Posted 2 years ago

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Photo of Victoria Bampton - Lightroom Queen

Victoria Bampton - Lightroom Queen, Champion

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You need to set the crop ratio in the Develop module and the pixel dimensions in the Export dialog.

What are you currently doing, and what's the result you're getting ?
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Dianne Ahto

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I agree with Victoria. Something is changing your image during export. Click Export, see the pop up dialog box and examine thoroughly.
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Max Johnson, Champion

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If you open your exported image in Photoshop after you save it out, but before you upload it to the website, is it still correct?
" when i upload to the website, the size is different" - This makes me think it's changing at the website level.
I'm just guessing, but it might have something to do with the resolution being 300dpi while standard web images are at 72dpi.
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Constantine McFin

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Victoria Bampton, Dianne Ahto, i am currently doing pictures for online clothing boutique. I did all these things but still...
Max Johnson, i open the exported images in Photoshop before the uploading and the size is exactly what i want. Then i send them (via we transfer) to my client and she cannot upload them because of the 'wrong' size.
This is the first time i face something like this.
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Max Johnson, Champion

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I agree with Victoria. Something is happening on their end and they are not communicating what it is very well. Sorry if this is all info you already know: For viewing on the web, the 300dpi is irrelevant. Web pages will display images at 72dpi, so your size of 1281w x 1920h is going to be GIGANTIC considering that most screens are 1920x1080 res these days. If it is going to be printed, then 300dpi *does* matter and your images will be 4.27x6.4 inches.

Are you certain the problem is with pixel dimensions and not file size? Many content management systems (like online shopping website plugins) have a file size limit per-image. If the specs are something like: "Max dimensions 2000x2000px or less than 200Kb", you may have a file that is too "big" in Kb size, in which case you'll have to either shrink the image dimensions or crank up the compression.
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Victoria Bampton - Lightroom Queen, Champion

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If they're the right size before uploading, confirmed in Photoshop, then it's something happening at her end, or she's not giving you the right information in the first place.
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Constantine McFin

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Victoria, that's what i thought but she told me that everything's fine with the website and all the info are right. After all, I'm thinking maybe it's 'we transfer' issue...

Max, my certain problem is the pixel dimensions, not the file size.
The pictures are only for the website. Not to be printed.

If you guys have time, please, check http://shopfabrika.com/ 
Click on 'mens' or 'womens' and see the pictures with the grey backround. This is the size and the resolution i need.

Also, i need to change the homepage but i need the size and the resolution with the same picture that is already on the homepage. 
Any idea?

Guys, thank you so much!!!!!
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Victoria Bampton - Lightroom Queen, Champion

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It's highly unlikely that WeTransfer's involved, since they're just transferring the files. 

Tell us exactly what size she told you she needs, and exactly what settings you're choosing in the Export dialog. Then also exactly what error message she's getting when she tries to upload. We're going in circles without this information. This is a communication issue, not a software one.
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Bruce Houstoun

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It looks like you may have been given the wrong pixel dimensions?
All of the photos on the Fabrika site I checked are 1281x1921 not 1920,  this 1 pixel error may cause Lightroom to use a different aspect ratio than you need/want.

Also found one at 1366x2048.

Also the correct dimensions may be actually 1280x1920 but there is a 'hidden' 1x1 pixel image in the web photo frame that is used to prevent right clicking and saving the images thereby messing up your pixel dimensions/aspect ratio requirements.

So I would get the client to double check those image size requirements.
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Constantine McFin

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Victoria, she needed 1281 x 1920 and that was what i was choosing in the export dialog.
I also, did every single picture from develop module (crop ratio).
But for some reason, after the last update, it works... THANK GOD!!!

Bruce, thanks for spending time and check the site.
I didn't even know that the frame may cause a problem... Maybe that ''hidden'' pixel was the problem. I actually told to my client to talk with her web developers.

But finally, everything's fine!

Guys thank you very much!!!!!!!!!
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Victoria Bampton - Lightroom Queen, Champion

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Great, thanks for the update