Resizing / Printing Images Question

digital paradise wrote in post #18689206
Don't know why but after all these years they still call it DPI.

I think it’s because within the universal term, PPI and DPI are units within Dot Pitch sizes. Pixels on monitors and dots with ink jet printers have had sub dots to construct color.

As for screen PPI, to reenforce other comments, it is a result of resolution and screen size.

john crossley wrote in post #18689225
According to Photoshop they are BOTH at 300PPI.

Hmmm. I've used those before as for an example. I have a second set. If this doesn't work I'll do a set as we speak.

birderman wrote in post #18689226
You don't mention what the size was for the Emails, assuming these were around 72-100ppi (for HD screen 1920 by 1080 pixels) to give good display on most monitors then I would wouldn't expect a need to resize them to make 4x6 prints. But if you want to print out 10x8 or similar then you would be needing to add non existent pixels to print at 300ppi (3000 x 2400 pixels) hence the softening of the image.

The best method is during export from LR of the original file define how many pixels you want and ignore the PPI setting it is not used in most export operations. Work out how many pixels you require by multiplying the print size by required resolution. Note this is NOT same as cropping an image and the whole picture will be resized by lightroom to fight the pxiel dimensions your define. If you require different sizes of print then export for largest size print there is no need for different Jpegs for each size of print as the printers will manage the reduction in size.


HTH

PPI doesn't matter for emails. It can be anything you like.

Start at minute 8.

https://www.youtube.co​m …4mV3NsLmXw&feat​ure=relmfu

digital paradise wrote in post #18689242
Hmmm. I've used those before as for an example. I have a second set. If this doesn't work I'll do a set as we speak.

If exporting from Photoshop, it defaults to resetting PPI setting.

davesrose wrote in post #18689251
If exporting from Photoshop, it defaults to resetting PPI setting.

It does? It changes the PPI when you use a save command? Not sure about that. If I use the Image Size command in PS and change the PPI I'm pretty sure it stays that way.

I'm pretty sure I used LR when I exported the original set of ducks.

digital paradise wrote in post #18689242
Hmmm. I've used those before as for an example. I have a second set. If this doesn't work I'll do a set as we speak.

Hosted photo: posted by digital paradise in
./showthread.php?p=186​89242&i=i233221664
forum: RAW, Post Processing & Printing

Hosted photo: posted by digital paradise in
./showthread.php?p=186​89242&i=i104746467
forum: RAW, Post Processing & Printing

And they are both 300ppi.

digital paradise wrote in post #18689257
It does? It changes the PPI when you use a save command? Not sure about that. If I use the Image Size command in PS and change the PPI I'm pretty sure it stays that way.

I'm pretty sure I used LR when I exported the original set of ducks.

If you do Save As, it will keep PPI settings: Export doesn’t by default.

I just opened one of the duck images in PS and the resize command does say 300. I have not used that command since getting PC CC. I changed it to 240 PPI and opened a different file and you are correct - it was at 300 again. Sorry about that.

So it it looks like it does default to 300 every time. I don't remember it doing that many years ago. Either way I can assure you I exported both sets of the examples at 0 and 1000 PPI. Looks like PS wants to set them at 300 when you checked them. Also I can find multiple references that will say PPI does not effect screen resolution. When I took a PS course in 2005 they told us 72 but that was incorrect.

john crossley wrote in post #18689258
And they are both 300ppi.

Because PS wants to export them at 300 PPI by default so that is why you see 300. If you like I'll do it in real time, take screen shots of the PPI I exported at and post the images.

I can assure you they were exported at 0 and 1000.

Left Handed Brisket wrote in post #18688774
Your attempt at biting wit aside, calling the printer is the correct answer.

I have outsourced traditional offset, flexography, digital toner based, inkjet, dye sub, screen printing, and more for single sheets, short run books, catalogs, stationary, point of purchase, banners, trade show booths and so on.

Call the printer.

Sorry, your initial reply kind of struck me the wrong way.
I sort of took it as a don't bother wasting our time kind of thing.

LR seems to work differently. I went to the export page and it was 300. I set it to 100 and exported an image. I opened another file, went to the esport page and it stayed at 100. I guess that is the difference between PS an LR. PS does not have an exporting process that combines resizing, sharpening, media type and PPI on one page.

john crossley wrote in post #18689225
According to Photoshop they are BOTH at 300PPI.

Yeah, DPP is not the only program that states it wrongly...so does Adobe's Lightroom. Not sure if digital paradise simply made in error in posting two shots with '300' dpi embedded in the Exif data, but I certainly did not make that error in this post.
Here is a shot with lots of textural detail to compare, one JPG exported from Lightroom at 75 dpi and the other JPG exported at 300 dpi, moments apart. Both are 2715 x 1820 pixel files, at 75 dpi and 300 dpi Exif values (verified for X Resolution value and Y Resolution value with Opanda PowerExif)

Maybe I did. All I know is what I see in the resolution section of LR's export page it shows PPI. There is no option to select DPI, just PPC. I have no idea how to embed anything in the EXIF data. I have never attempted to edit it as I've never had the need to.

digital paradise wrote in post #18689278
LR seems to work differently. I went to the export page and it was 300. I set it to 100 and exported an image. I opened another file, went to the esport page and it stayed at 100. I guess that is the difference between PS an LR. PS does not have an exporting process that combines resizing, sharpening, media type and PPI on one page.

Now export the same image from Lightroom twice. The first at 300ppi and the second at 72ppi open them both in photoshop and view at 100%.

If the DPI setting actually changes the image resolution accordingly then of course there will be a difference. If DPI doesn't change the HxW size of the image, then it won't do anything at all to the 100% view.

Often resizing tools will try to be "smart" about what it changes if you change one factor over another. They are not all consistent however.