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DPChallenge Forums >> Tips, Tricks, and Q&A >> I messed up/resolution
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08/03/2021 01:29:23 PM · #1
I think I really messed up.

Several years ago (possibly more, no recollection) , I was doing shots just for FB and stuff, and stuck my resolution down to 75, as I didn't want high on there as I had some problems with people pinching and printing the photos. I have actually had some printed on 16x20 canvas and they looked normal.
My question is, can I drag and drop that photo back into PS and bump up the Res to 600 and then save as. Or is it a whole complete redo of the photo?? (JPEG saving was at max if that helps at all?)
08/03/2021 01:38:15 PM · #2
if Ok then I can help you with that, I have Topaz Gigapixel AI and I can bump the resolution and give you back big size file.
08/03/2021 02:34:29 PM · #3
What are the dimensions of the image in pixels? Changing the DPI does not change the image size.
08/03/2021 04:19:02 PM · #4
Usually DPC size, so 1500. I have done 3000 for printing, which was fine, but the resolution was 75 pixel/inches.

So this was all saved. So can I go back to that already saved print, open it and put it at 600 resolution and then resave it and it will chock full of ,,,,,Or can I not stuff it back in and expect any results for printing,

it seems that it is 3.41m both way

I think I am confusing myself now, as well.



Message edited by author 2021-08-03 16:24:38.
08/03/2021 05:52:17 PM · #5
Originally posted by JulietNN:

Usually DPC size, so 1500. I have done 3000 for printing, which was fine, but the resolution was 75 pixel/inches.

So this was all saved. So can I go back to that already saved print, open it and put it at 600 resolution and then resave it and it will chock full of ,,,,,Or can I not stuff it back in and expect any results for printing,

it seems that it is 3.41m both way

I think I am confusing myself now, as well.


I would try downloading the free trial of topaz gigapixel. I think it does a better job then just adjusting in Photoshop.
08/03/2021 07:51:45 PM · #6
Originally posted by JulietNN:

I think I am confusing myself now, as well.

"Resolution" (dpi) ONLY determines how large (in inches/cm) a picture will print on a given printer. If you change the resolution WITHOUT resampling it doesn't change the image. Remember that the resolution setting refers to Inches-PER-Inch ...

An image which is 1500 pixels wide will print:

5 inches wide at 300 dpi (1500/300)

10 inches wide at 150 dpi (1500/150)

20 inches wide at 75 dpi (1500/75)

What matters is whether you have enough pixels to print at the size you want on the particular printer you want to use, which can vary a lot; photo printers "like" 300dpi but will often give an OK result at 150dpi, while canvas can probably go as low as 100dpi (most monitors display at either 72 or 96 dpi). How much resolution you "need" also depends on the image; lots of fine detail will need a higher resolution than (for example) a picture of a building on a foggy day.

If you do need to change the image size check out this tutorial and/or take advantage of the offers here to up-sample it for you ...

Message edited by author 2021-08-03 19:55:02.
08/03/2021 09:14:30 PM · #7
yes, that is another option, you can download and use that application.

Originally posted by vawendy:

Originally posted by JulietNN:

Usually DPC size, so 1500. I have done 3000 for printing, which was fine, but the resolution was 75 pixel/inches.

So this was all saved. So can I go back to that already saved print, open it and put it at 600 resolution and then resave it and it will chock full of ,,,,,Or can I not stuff it back in and expect any results for printing,

it seems that it is 3.41m both way

I think I am confusing myself now, as well.


I would try downloading the free trial of topaz gigapixel. I think it does a better job then just adjusting in Photoshop.
08/03/2021 09:15:01 PM · #8
+1 to this resolutions as I have had a good discussion with the printing company on this and matches to what General mentioned below.

Originally posted by GeneralE:

Originally posted by JulietNN:

I think I am confusing myself now, as well.

"Resolution" (dpi) ONLY determines how large (in inches/cm) a picture will print on a given printer. If you change the resolution WITHOUT resampling it doesn't change the image. Remember that the resolution setting refers to Inches-PER-Inch ...

An image which is 1500 pixels wide will print:

5 inches wide at 300 dpi (1500/300)

10 inches wide at 150 dpi (1500/150)

20 inches wide at 75 dpi (1500/75)

What matters is whether you have enough pixels to print at the size you want on the particular printer you want to use, which can vary a lot; photo printers "like" 300dpi but will often give an OK result at 150dpi, while canvas can probably go as low as 100dpi (most monitors display at either 72 or 96 dpi). How much resolution you "need" also depends on the image; lots of fine detail will need a higher resolution than (for example) a picture of a building on a foggy day.

If you do need to change the image size check out this tutorial and/or take advantage of the offers here to up-sample it for you ...
08/03/2021 09:15:58 PM · #9
You guys rock! Thank you all so much for the answers. I really appreciate the help and time you all took. xox
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