HDRI doesn't emit light in 3d software
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Antonio Prodon
Jun 16, 2021, 9:19:37 AM6/16/21
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Hi all,
I'm trying to produce hdri images to use as light map in 3d rendering softwares, unfortunately when I use the final image in 3d software (tested on blender and 3dsmax + vray) the hdri doesn't emit light.
That's my workflow:
- 360 images stitching
- exporting hdri panorama
- converting hdri panorama in cubic images
That's my workflow:
- 360 images stitching
- exporting hdri panorama
- converting hdri panorama in cubic images
- opening them in Photoshop for image correction (like tripod removal)
- exporting from PS in dhri radiance format
- reassembling in PtGui
This proces result produce a file that doesn't work in blender and 3ds, in the image below ther's the sun at full brightness and in 3d rendering the light is poor and diffuse, seems that doesn't emit the right light map.
Any suggestions? In wich step I'm wrong? Soon I'll do some tests in every single step, using hdri after ptgui stith and after PS editing to see where could be the error.
HDRI TEST: hdri test
- exporting from PS in dhri radiance format
- reassembling in PtGui
This proces result produce a file that doesn't work in blender and 3ds, in the image below ther's the sun at full brightness and in 3d rendering the light is poor and diffuse, seems that doesn't emit the right light map.
Any suggestions? In wich step I'm wrong? Soon I'll do some tests in every single step, using hdri after ptgui stith and after PS editing to see where could be the error.
HDRI TEST: hdri test
PTGui Support
Jun 16, 2021, 11:59:44 AM6/16/21
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Hi Antonio,
In Photoshop's 'Info' tool, there's an rgb eyedropper tool. You can
switch this to 32 bit mode, it should show you the actual rgb values
under the cursor. The values can be greater than 1.
This should allow you to check where things go wrong. PTGui will output
colors brighter than 1. Perhaps things go wrong somewhere else in your
workflow.
.hdr is not the best quality format to use by the way. Better use .exr
or 32 bit floating point tiff.
Kind regards,
Joost Nieuwenhuijse
www.ptgui.com
> <https://www.mediafire.com/file/jyq2uxms2brlm7w/Lago_daylight_PS.hdr/file>
>
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In Photoshop's 'Info' tool, there's an rgb eyedropper tool. You can
switch this to 32 bit mode, it should show you the actual rgb values
under the cursor. The values can be greater than 1.
This should allow you to check where things go wrong. PTGui will output
colors brighter than 1. Perhaps things go wrong somewhere else in your
workflow.
.hdr is not the best quality format to use by the way. Better use .exr
or 32 bit floating point tiff.
Kind regards,
Joost Nieuwenhuijse
www.ptgui.com
>
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Antonio Prodon
Jun 18, 2021, 4:43:24 AM6/18/21
to PTGui Support
Hi, thanks for the suggestion.
I've done with the previous test image and the value on the direct sun is little brighter than 1 and that's strange.
I'll produce an other panorama and export that in .hdr and .exr and then I'll test in same way before and after PS.
I've done with the previous test image and the value on the direct sun is little brighter than 1 and that's strange.
I'll produce an other panorama and export that in .hdr and .exr and then I'll test in same way before and after PS.
PTGui Support
Jun 18, 2021, 4:50:27 AM6/18/21
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How did you bracket your images?
If you just did a -1 / 0 / +2 then this is actually the expected result.
If you really want the HDRI to represent the actual sun's luminance,
then you'll have to bracket all the way until the sun is not overexposed
in one of your source images.
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If you just did a -1 / 0 / +2 then this is actually the expected result.
If you really want the HDRI to represent the actual sun's luminance,
then you'll have to bracket all the way until the sun is not overexposed
in one of your source images.
On 18/06/2021 10:43, Antonio Prodon wrote:
> Hi, thanks for the suggestion.
> I've done with the previous test image and the value on the direct sun
> is little brighter than 1 and that's strange.
> I'll produce an other panorama and export that in .hdr and .exr and then
> I'll test in same way before and after PS.
>
> Hi, thanks for the suggestion.
> I've done with the previous test image and the value on the direct sun
> is little brighter than 1 and that's strange.
> I'll produce an other panorama and export that in .hdr and .exr and then
> I'll test in same way before and after PS.
>
> hdri color piker.JPG
>
> Il giorno mercoledì 16 giugno 2021 alle 17:59:44 UTC+2 PTGui Support ha
> scritto:
>
> Hi Antonio,
>
> In Photoshop's 'Info' tool, there's an rgb eyedropper tool. You can
> switch this to 32 bit mode, it should show you the actual rgb values
> under the cursor. The values can be greater than 1.
>
> This should allow you to check where things go wrong. PTGui will output
> colors brighter than 1. Perhaps things go wrong somewhere else in your
> workflow.
>
> .hdr is not the best quality format to use by the way. Better use .exr
> or 32 bit floating point tiff.
>
> Kind regards,
>
> Joost Nieuwenhuijse
> www.ptgui.com <http://www.ptgui.com>
>
> Il giorno mercoledì 16 giugno 2021 alle 17:59:44 UTC+2 PTGui Support ha
> scritto:
>
> Hi Antonio,
>
> In Photoshop's 'Info' tool, there's an rgb eyedropper tool. You can
> switch this to 32 bit mode, it should show you the actual rgb values
> under the cursor. The values can be greater than 1.
>
> This should allow you to check where things go wrong. PTGui will output
> colors brighter than 1. Perhaps things go wrong somewhere else in your
> workflow.
>
> .hdr is not the best quality format to use by the way. Better use .exr
> or 32 bit floating point tiff.
>
> Kind regards,
>
> Joost Nieuwenhuijse
> <https://groups.google.com/d/msgid/ptgui/21b95a8d-cc85-4289-9271-0d4ee9a18c37n%40googlegroups.com?utm_medium=email&utm_source=footer>>.
>
>
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Antonio Prodon
Jun 18, 2021, 4:57:22 AM6/18/21
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Hi Joist,
I've used a 5 step bracketed images an the lighter of them is 70% overexposed.
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PTGui Support
Jun 18, 2021, 5:16:20 AM6/18/21
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You should bracket all the way to -20EV at least, if you want the sun to
have its actual brightness in the HDRI.
I'm pretty sure the sun is blown out at rgb(255,255,255) in all your 5
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have its actual brightness in the HDRI.
I'm pretty sure the sun is blown out at rgb(255,255,255) in all your 5
On 18/06/2021 10:57, Antonio Prodon wrote:
> Hi Joist,
>
> I've used a 5 step bracketed images an the lighter of them is 70%
> overexposed.
>
> Il ven 18 giu 2021, 10:50 'PTGui Support' via PTGui Support
> <pt...@googlegroups.com <mailto:pt...@googlegroups.com>> ha scritto:
> Hi Joist,
>
> I've used a 5 step bracketed images an the lighter of them is 70%
> overexposed.
>
> Il ven 18 giu 2021, 10:50 'PTGui Support' via PTGui Support
>
> How did you bracket your images?
>
> If you just did a -1 / 0 / +2 then this is actually the expected result.
>
> If you really want the HDRI to represent the actual sun's luminance,
> then you'll have to bracket all the way until the sun is not
> overexposed
> in one of your source images.
>
> Kind regards,
>
> Joost Nieuwenhuijse
> www.ptgui.com <http://www.ptgui.com>
> How did you bracket your images?
>
> If you just did a -1 / 0 / +2 then this is actually the expected result.
>
> If you really want the HDRI to represent the actual sun's luminance,
> then you'll have to bracket all the way until the sun is not
> overexposed
> in one of your source images.
>
> Kind regards,
>
> Joost Nieuwenhuijse
> > > <mailto:ptgui+un...@googlegroups.com
> <mailto:ptgui%2Bun...@googlegroups.com>>.
> > > To view this discussion on the web visit
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Antonio Prodon
Jun 18, 2021, 5:20:59 AM6/18/21
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You think?
Technically when an image is totally burned in light at +5 will not be the same at +20?
If you're right the only way to do this bracket is manually, then I know that in ptGui I could link manually all images, I've tested it before and didn't work but I've to read more about the manual link.
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Erik Krause
Jun 18, 2021, 5:49:46 AM6/18/21
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Am 18.06.21 um 11:20 schrieb Antonio Prodon:
--
Erik Krause
> You think?
> Technically when an image is totally burned in light at +5 will not be the
> same at +20?
read again: -20 not +20 ...
> Technically when an image is totally burned in light at +5 will not be the
> same at +20?
--
Erik Krause
Antonio Prodon
Jun 18, 2021, 12:13:12 PM6/18/21
to PTGui Support
Thanks Erik,
I understood what Joost mean, In all my shoot I've onsly 255 8bit values for the sun so hdri doesn't have enough information to produec all the dinamic range for the sun that's why I've to shoot also darkest images.
I'll try doing before 5 and then 7 bracket images underexposing the image to reach the darkest image (for automatic shooting session) If doesn't work fine I'll try with manual shooting and link.
Thanks all for now.
I'll try doing before 5 and then 7 bracket images underexposing the image to reach the darkest image (for automatic shooting session) If doesn't work fine I'll try with manual shooting and link.
Thanks all for now.
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