Exporting high resolution pictures and local manipulation tool

Software RawTherapee
1

Hi all,
I am Gianni and I am a newbie and I am facing a little problem that I can not solve by myself:
After having worked on a raw file in RT 5.4 (both Linux and Mac), I need to output as a 100% size at 300ppi Tif.
I have managed to do the steps described in rawpedia to have the result I need but… I am still having a perfect TIF file 4 times sized but at 72 ppi. There is any way to have my file at 300ppi out of RT?!?!?

I take the occasion to ask if there is also a tool (maybe a brush) to work on my photo locally?
Thanks a lot for your help.!!!

2

Hi @Gianni_Saccardo

PPI means nothing, ignore it.
Learn more about what it is here:

If you disable the Resize tool, you will get a full-sized, 100% image.

Local editing is not possible in RT, but RT can export the image directly to GIMP.

3

Thanks Morgan,
for the tool… I’ve argued that there is any other way than external editor.

Speaking about resolution, please take a look at the 2 screenshot

01
011875×1367 2.62 MB
00
002560×1440 3.71 MB

As You may see the result is a 72ppi image. I need it to be 300.
I can’t find a way to do it in RT.

Thanks for your support.

4

In Photoshop, just change the 72 to 300.

5

@Gianni_Saccardo what about the image do you expect to change by setting it to 300PPI?

6

Too basic to be useful…

7

Easy, size and resolution.
That means no lost of time resizing elsewhere :wink:

8

Hi @Gianni_Saccardo,

without knowing the output size in inches (or in some saner unit like cm :-), saying that you need “300PPI” doesn’t mean anything… what is the output size you want?

9

I’m developing some images for a book on Blurb, they ask for a certain size and a certain resolution, having to resize all in some external editors sounds tricky and need a passage more, this means time.
After all RT is a great piece of software, sharpening and noise reduction modules are first class product.
Alsa color correction is quite easy and powerfull, local contrast and retinex works perfectly.
But not having the possibility to export in a certain size on a certain resolution… make no sense for me!
(A brush for local correction would be the perfect gift)

10

As you can see from the screenshot, I was expecting a 34x51 cm /300ppi image.
At the end I had a 72x200cm /72ppi…

11

Which means you need an (approx) 6000x4000 image. When printed at 300ppi resolution, it will result in 6000/300 x 4000/300 inches, i.e. 20x13.33 inches, i.e. 50.8x33.8 cm…

Or perhaps you are asking that the intended PPI is part of the image metadata?

12

If this is the case, this should do (assuming your image is actually 6000x4000):

$ exiftool -XResolution=20 -YResolution=13.3 -ResolutionUnit=in FILENAME.tif
13

So what you’re really asking for is not setting some metadata tag, but changing the pixel resolution of an image to fit a given physical size at a given pixel density. That is not easily doable yet. Keep an eye out on issue #54.

14

There must be something I’m missing… :thinking:
sure it would be convenient to have this in RT, but if you know the PPI, determining the required size in pixels is not that hard, isn’t it?

15

@agriggio it’s not easily doable in RT. You’d either need to whip out the calculator.exe, or abuse the crop tool’s PPI calculation. Neither is user-friendly.

16

Ok, found how to do it.
CROP panelworks only exporting a jpg, tif comes out at 72, strange…

17

It could work… tif, would be better, but it works.
@Morgan_Hardwood Morgan, are you the engineer behind RT?

18

@Gianni_Saccardo JPEGs come out with XResolution=YResolution=300. TIFFs don’t have those tags set at all. The PPI setting in the Resize tool does not get saved as a tag.

@agriggio and I are from the RawTherapee project, there are others.

19

I’ll see what I can do about #54 once I’m done with a few other issues.

20

Thanks a lot for your help.
I think that RT worth gold, so developping it is a great (and hard job).
@agriggio I think you are italian, right?
Tell me how may I contribute (not only economically) to enhance this wonderful project.
I see a great potential in it!