Kolor Forums | Autopano & Panotour help, Panogear, Merlin / Orion / Colorshift repairing nadir using krpano Convert SPHERE to CUBE droplet

leifs · 2012-11-14 22:07:33

My workflow shooting spheres with 50mm eq includes fixing the nadir using krpano Convert SPHERE to CUBE droplet to get a down-image. Then I repair the nadir and convert it back to sphere using krpano Convert CUBE to SPHERE droplet.
Technically this works well. Now, by accident I noticed that this back and forth changes the colors, the result is a less vivid pano.
The pano is rendered in APG 3.0 B3 to PSB (from TIFF sources) and krpano convert it to TIFF.

Is there anybody who has ideas about what to do ?

Leif

Uploaded Images

HansKeesom · 2012-11-14 22:57:44

i like the bottom one more.....

leifs · 2012-11-15 00:03:00

HansKeesom wrote:
i like the bottom one more.....

The top one is the PSB from APG. (from TIFF's generated by DXO)
The bottom one is after back/forth to krpano.

Leif

lumelix · 2012-11-15 14:33:44

Hi
Do you use different color spaces or different bit-depth ?
Color shift is normally when change the color space.

klausesser · 2012-11-15 15:13:14

leifs wrote:
HansKeesom wrote:
i like the bottom one more.....
The top one is the PSB from APG. (from TIFF's generated by DXO)
The bottom one is after back/forth to krpano.

Leif

lumelix wrote:
Hi
Do you use different color spaces or different bit-depth ?
Color shift is normally when change the color space.

A vital point! In the prefs for the KRPano droplets you can set "fast" as false or true. Use "false".
You also can set it - preferable - to the same format as the input. In this case: .psb.

I never had the colors changed this way.

best, Klaus

Last edited by klausesser (2012-11-15 15:14:18)

con · 2012-11-16 11:57:50

is there a colour sampling setting when using KRPano (422 or similiar??)
Surely this affects your colour massively

leifs · 2012-11-16 20:46:30

In the convertdroplets config there is nothing about colorspace.
I have used the default setting:

[Convert SPHERE to CUBE]
cubeformat=CUBE
cubesize=auto
outputformat=tif
tiffcompress=lzw
jpegquality=85
jpegsubsamp=422
jpegoptimize=true
fast=false

I will change the output format to PSB and have look.

Leif

leifs · 2012-11-16 22:08:50

I have changed the output format in the convertdroplets.config:

[Convert SPHERE to CUBE]
cubeformat=CUBE
cubesize=auto
outputformat=PSB

[Convert CUBE to SPHERE]
spheresize=auto
outputformat=PSB

Then I ran a roundtrip sphere->cubeface->sphere and voila !
There is no colorshift

Solved. Thanks to Klaus for the tip :)

Leif

Uploaded Images

Last edited by leifs (2012-11-16 22:10:27)

con · 2012-11-19 10:35:50

interesting, so it was the tiling file compression then.

lumelix · 2012-11-19 15:56:21

No, it was the difference between TIFF and PSB.
There probably were several colorspaces defined.

Color shift -> different colorspace and/or bit-depth.
Compression or chroma subsampling should not affect the colors
in a visible range.

Last edited by lumelix (2012-11-19 16:07:09)

con · 2012-11-20 11:11:02

@lumelix

okay, so couple of nerdy questions for you then so I can try and get a better handle on things...

"Color shift -> different colorspace and/or bit-depth."
If both the tiff (uncompressed) and the psb are 8-bit, and are both defined with same colourspace - then they should have no colour difference. Is that right?

would the tiffcompress=lzw not have any effect on the colour then?

lumelix · 2012-11-20 18:08:25

Hi con

Yes, it should LZW means lossless compression and with the same color space and bit-depth
the two images should look the same (overall).
But if you handle with 8bit TIFs, you will lose some fine informations from your camera:
Actual DSLRs works with 12bit, so with 8bit, you loose a lot of color fine toning, 4096 times less (2^12).
Most of time, this is visible in blue sky areas. You will see some banding there, not a fine color gradient.

For best results, work with RAW files and convert them with suitable software to 16bit TIF LZW.
For normal use, 24bit JPGs with slight compression are fine too.

M.Estevez · 2012-11-25 19:32:28

Hi everyone

Haw or where Can I adjust convertdroplets.config

Thanks

Best regards

klausesser · 2012-11-25 22:18:39

M.Estevez wrote:
Hi everyone

Haw or where Can I adjust convertdroplets.config

Thanks

Best regards

Folder: KRPanoTools, here "convertdroplets.config"

best, Klaus

M.Estevez · 2012-11-26 21:56:57

Hi Klausesser

Thanks
But I don´t find one for convert EQ to CUBE

My folders order is this

https://picasaweb.google.com/1123179703 … rtEQToCUBE

Best regards

klausesser · 2012-11-26 22:51:14

M.Estevez wrote:
Hi Klausesser

Thanks
But I don´t find one for convert EQ to CUBE

My folders order is this

https://picasaweb.google.com/1123179703 … rtEQToCUBE

Best regards

"Convert sphere to cube"

best, Klaus

M.Estevez · 2012-11-28 00:19:02

Hi

I go to Sphere tu cube and SHOW CONTENT OF THE PACKAGE
In this I find -info.plist -
I open it and change for PSD
but it continues making tiff cube images

I will look for other way

https://picasaweb.google.com/1123179703 … rtEQToCUBE

gkaefer · 2012-11-28 13:45:00

M.Estevez wrote:
Hi

I go to Sphere tu cube and SHOW CONTENT OF THE PACKAGE
In this I find -info.plist -
I open it and change for PSD
but it continues making tiff cube images

I will look for other way

https://picasaweb.google.com/1123179703 … rtEQToCUBE

according to krpano documentation the cube to sphere and sphere to cube droplets are based on the tool ktransform and on its docu page psd/psb are also listed as in/output format...
http://www.krpano.com/tools/ktransform/#top

so why not using the ktransform tool directly on command line:

Code:

ktransform cube mysourcepanoimage.psd cubesoutputfilename

Georg

klausesser · 2012-11-28 14:41:14

M.Estevez wrote:
Hi
I go to Sphere tu cube and SHOW CONTENT OF THE PACKAGE
In this I find -info.plist -
I open it and change for PSD
but it continues making tiff cube images

Wrong place - go to KRPanotools folder and open "convertdroplets.config"!

Klaus

M.Estevez · 2012-11-28 18:38:27

I have updated Krtools
and now I have "convert droplets.config"

Before I have not it

Thanks

Best regards

#1 2012-11-14 22:07:33

Colorshift repairing nadir using krpano Convert SPHERE to CUBE droplet

#2 2012-11-14 22:57:44

Re: Colorshift repairing nadir using krpano Convert SPHERE to CUBE droplet

#3 2012-11-15 00:03:00

Re: Colorshift repairing nadir using krpano Convert SPHERE to CUBE droplet

HansKeesom wrote:

#4 2012-11-15 14:33:44

Re: Colorshift repairing nadir using krpano Convert SPHERE to CUBE droplet

#5 2012-11-15 15:13:14

Re: Colorshift repairing nadir using krpano Convert SPHERE to CUBE droplet

leifs wrote:

HansKeesom wrote:

lumelix wrote:

#6 2012-11-16 11:57:50

Re: Colorshift repairing nadir using krpano Convert SPHERE to CUBE droplet

#7 2012-11-16 20:46:30

Re: Colorshift repairing nadir using krpano Convert SPHERE to CUBE droplet

#8 2012-11-16 22:08:50

Re: Colorshift repairing nadir using krpano Convert SPHERE to CUBE droplet

#9 2012-11-19 10:35:50

Re: Colorshift repairing nadir using krpano Convert SPHERE to CUBE droplet

#10 2012-11-19 15:56:21

Re: Colorshift repairing nadir using krpano Convert SPHERE to CUBE droplet

#11 2012-11-20 11:11:02

Re: Colorshift repairing nadir using krpano Convert SPHERE to CUBE droplet

#12 2012-11-20 18:08:25

Re: Colorshift repairing nadir using krpano Convert SPHERE to CUBE droplet

#13 2012-11-25 19:32:28

Re: Colorshift repairing nadir using krpano Convert SPHERE to CUBE droplet

#14 2012-11-25 22:18:39

Re: Colorshift repairing nadir using krpano Convert SPHERE to CUBE droplet

M.Estevez wrote:

#15 2012-11-26 21:56:57

Re: Colorshift repairing nadir using krpano Convert SPHERE to CUBE droplet

#16 2012-11-26 22:51:14

Re: Colorshift repairing nadir using krpano Convert SPHERE to CUBE droplet

M.Estevez wrote:

#17 2012-11-28 00:19:02

Re: Colorshift repairing nadir using krpano Convert SPHERE to CUBE droplet

#18 2012-11-28 13:45:00

Re: Colorshift repairing nadir using krpano Convert SPHERE to CUBE droplet

M.Estevez wrote:

Code:

#19 2012-11-28 14:41:14

Re: Colorshift repairing nadir using krpano Convert SPHERE to CUBE droplet

M.Estevez wrote:

#20 2012-11-28 18:38:27

Re: Colorshift repairing nadir using krpano Convert SPHERE to CUBE droplet

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