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Feature #11828

Minimum upscaling requested

Added by Al Bogner 10 months ago. Updated 10 months ago.

Status:
New
Priority:
Low
Assignee:
-
Category:
Lighttable
Target version:
-
Start date:
11/20/2017
Due date:
% Done:

0%

Affected Version:
2.2.5
System:
Ubuntu
bitness:
64-bit
hardware architecture:
amd64/x86

Description

With old photos lower than 10MP (4:3) upscaling with darktable can be better than upscaling with the tv. So I request a feature that creates the output with a minimum resolution and/or a maximum resolution.

Eg create a minimum resolution of 3840x2560 and not bigger then 6000x4000.

History

#1 Updated by Roman Lebedev 10 months ago

Al Bogner wrote:
Have you read https://www.darktable.org/usermanual/ch02s03s12.html.php#d0e3361 ?

With old photos lower than 10MP (4:3) upscaling with darktable can be better than upscaling with the tv. So I request a feature that creates the output with a minimum resolution and/or a maximum resolution.

Eg create a minimum resolution of 3840x2560 and not bigger then 6000x4000.

#2 Updated by Al Bogner 10 months ago

Roman, yes I know https://www.darktable.org/usermanual/ch02s03s12.html.php#d0e3361

but I am requesting the opposite.

Eg. source 3000x2000

means that the outpout maximum is 3000x2000 with 0x0

I could set 4500x3000 for output eg, then the output would be upscaled

Now imagine another image in the filmroll has 6000x4000 with the setting above it would be resized to 4500x3000, which I don't want. I want eg a minimum size of 4500x3000, but if my source is larger it should not be downsized, which can be reached with 0x0 only. But 0x0 does not upscale the image.

The problem arises mainly with old pictures, which have a low resolution. If you have a filmroll with low and high resolution images you cannot set the szenario above. The real life szenario are files for an UHD TV, where the tv should not do the upscaling.

#3 Updated by Tobias Ellinghaus 10 months ago

This could probably be done by an "upscale only" option in the upscale dropdown.

#4 Updated by Al Bogner 10 months ago

I am not sure what you mean. There is a dropdown menu below the size input. Upscaling is allowed there. This doesn't help. I have 2 options 0x0 or a size, The size always limits the maximal output and not the minimal output.

Again I want a minimal size of eg 3840x2560 (UHD size), where the filmroll contains eg a photo with 3000x2000 and 6000x4000, the smaller photo should be then 3840x2560 and the larger 6000x4000.

I think this should be coded easily, if size is lower or equal than than axb then size is axb, else use 0x0.

#5 Updated by Tobias Ellinghaus 10 months ago

I was talking about adding a 3rd option there, that makes dt upscale to fit the specified size but never downscale. That would do what you were asking for.

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