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Is saving a tiff as a jpg better in Preview on my Mac or in Photoshop? Is there a difference?

Explorer ,
Nov 15, 2020

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Does any one know if UPsizing an image from a tiff or psd to a jpg is bet done in PS or in the Preview program on my Mac? Or does it even matter? 

I need to create jpgs that are about 50-60 inches from my tiff and psd files. The originals are only the usual 18x27 as they come out of the camera.

I don't understand how a jpg can be used for such a large image, but understand that the compression of pixels makes it a viable process.

 

Any input would be great.

 

 

 

 

 

 

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Is saving a tiff as a jpg better in Preview on my Mac or in Photoshop? Is there a difference?

Explorer ,
Nov 15, 2020

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Does any one know if UPsizing an image from a tiff or psd to a jpg is bet done in PS or in the Preview program on my Mac? Or does it even matter? 

I need to create jpgs that are about 50-60 inches from my tiff and psd files. The originals are only the usual 18x27 as they come out of the camera.

I don't understand how a jpg can be used for such a large image, but understand that the compression of pixels makes it a viable process.

 

Any input would be great.

 

 

 

 

 

 

+9-**-9**

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Mac, Problem or error

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62

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Nov 15, 2020 0
Advocate ,
Nov 15, 2020

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Try it in PS, Image - Image Size. I just tried a resize of a 10 inch wide image to 40 inches wide and at 100% view, it doesn't look that bad. To enlarge an image, PS has to make up pixels. I am assuming that a large image like 50-60 inches would be viewed from some distance, not close up. That will mean the image might look ok, but only you will be able to decide what is acceptable.

You should not use JPG until the last step is necessary to send the image out for printing if that is going to be your final project. JPG compression is accomplished by throwing away detail in the image file. Multiple saves of the same JPG file to JPG will result in terrible image deterioration.

Kenneth Seals

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Nov 15, 2020 2
LEGEND ,
Nov 15, 2020

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You don’t mention the images’ pixel dimensions/resolution, so you may not have fully thougt through the issue. 

For large prints smaller resolutions are often sufficient, so upscaling without resampling might be enough. 

 

If you actually need to upsample the images try Photoshop’s »Preserve Details« and »Preserve Details 2.0« Resample Methods. 

You could also try the new »Super Zoom« (Filter > Neural Filters > Beta filters > …). 

 

And as mentioned before: Jpg employs lossy compression and is therefore to be avoided until the last hand-off-file if possible. 

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Nov 15, 2020 1
Explorer ,
Nov 22, 2020

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I am a professional photograppher and have been published for over 30 years. But I have never had to do anything with the images since the magazines and book publishers did all the work.. when we used to shoot transparencies ... a gazillion of which need to be scanned. 

I wish to put these images on Saatchi Art and some are unique enough to be corporate pieces in areas that have traffic or in a corporate venue.

I have been told that they only accept jpgs and if I want to offer any of them upsized that jpgs compress the pixels but will enlarge well when printed. I have two methods to do this. Photoshop and a Mac program called Preview. I have been on PS since PS3 but this upsizing is new to me. 

I need to compress to jpg for acceptance on the site. I would think that PS would be the superior method but wanted to put this conundrum out there for input as this is not what I have been doing.

Thank you all.

Bonnie

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Nov 22, 2020 0
LEGEND ,
Nov 23, 2020

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As mentioned before: Photoshop 2021 offers some Resample Methods and a neural Filter that might be worth checking out. 

 

If the submitted files have to be jpg then that’s that. 

But I recommend that you do your work on layered psd-, psb- or tif-files, keep those and only save jpg-copies off of them. (Which you could to some degree automate with Actions, Image Processor, Batch, …) 

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Nov 23, 2020 0
Adobe Community Professional ,
Nov 16, 2020

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If this is an out-of-camera file, don't upsample. Just leave it. It's not necessary and will do more harm than good.

 

Of course, and as c.p. already said, it would be nice to know the actual pixel dimensions. But generally, you don't need 300 ppi for larger format prints. That has to be the most persistent myth in the entire history of digital imaging. The larger the print, the lower the required ppi, because it will be seen from farther away.

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Nov 16, 2020 1
Adobe Community Professional ,
Nov 22, 2020

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Preview offers basic resizing. It might do an acceptable job. If you need to resample for enlargement, Photoshop provides multiple options that Preview doesn’t have, highlighted in green below. Some photographers who are concerned about enlargement quality like to test each option, to determine which one looks the best for the kind of images they have.

 

Photoshop-vs-Preview-resize.jpg

 

Some photographers prefer to use separate software such as Topaz Gigapixel AI, that claims to make superior enlargements by preserving or artificially enhancing detail. If you were interested you would want to use the free trial to test whether it’s enough better than Photoshop to pay for.

 

JPEG compression is a separate step at the end, when you save (export) a copy to upload. Higher compression makes a smaller file for upload and download, but loses more image quality. Lower compression results in a larger file size and preserves more image quality. The goal is to find the right balance between file size and image quality. Which again, requires tests to see which settings work best for your images.

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Nov 22, 2020 1
D Fosse LATEST
Adobe Community Professional ,
Nov 23, 2020

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I'm still not convinced resizing is necessary or desirable at all. It never does any good except prevent visible pixels. That's the only justification, ever.

 

Not only does it take a huge print size to get to where you see the pixels, it also means you're so close that your nose is virtually in it. You would normally step away to take in the whole image and see it comfortably. And so the optical resolution stays the same.

 

Here's how that works. Extrapolate as needed:

ppi1.png

 

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Nov 23, 2020 1