rzwart2
Posts: 43
Location: Utrecht, Netherlands
Registered: 4 May 2008
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problem with masking
Posted: 30 Jan 2010 at 13:23 GMT
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I used tthis tutorial www.johnhpanos.com/alphatut.htm to mask parts in the nadir. When I save the tiff file with alpha channels it looks like everyting is oke, but when I use the file in Ptgui pro the mask isn't working. I still see the lower part of my body. What am I doing wrong?
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John Houghton
Posts: 3412
Location: Hitchin, United Kingdom
Registered: 17 Jan 2005
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Re: problem with masking
Posted: 30 Jan 2010 at 14:43 GMT
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Does the mask still look intact when you reopen the tiff file with Photoshop?
John
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Hans Nyberg
Posts: 2760
Location: Denmark
Registered: 28 Aug 2005
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Re: problem with masking
Posted: 30 Jan 2010 at 17:01 GMT
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Do you use enfuse. If you have enfused your images you will get an empty alphachannel 1 in the image. If you just save your new alphachannel it will be No 2 and that does not work.
You have to delete alpha 1 first or just replace it.
I do not know if I should call this a bug or a feature but my last Mac PTgui 8.3.6 actually crashes if I try to load an image with 2 alpha channels.
I tried some of the earlier versions and they loaded the image without protest.
Hans
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rzwart2
Posts: 43
Location: Utrecht, Netherlands
Registered: 4 May 2008
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Re: problem with masking
Posted: 31 Jan 2010 at 7:56 GMT
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Thnx John & Hans,
Hans, what do you mean with "enfuse" ?
After John's email I tried some ways to save my tiff: LZW, rgbrgb and for IBM (i'm working on a mac) seems to be good.
But when I load the file in PTgui de mask changes into black. When I render the panorama there is a black shade where the mask is placed. I have to try a little longer.
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John Houghton
Posts: 3412
Location: Hitchin, United Kingdom
Registered: 17 Jan 2005
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Re: problem with masking
Posted: 31 Jan 2010 at 8:51 GMT
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Enfuse is a blending program used to merge a number of differently exposed images in to one, in order to capture a greater dynamic range. An alpha channel is generated in the output image, so for masking purposes you don't need to create a second one yourself. Just edit the one that's there. You should have only the one mask channel.
When you load the masked image into PTGui, the masked areas should show as transparent in the various windows. A stitched jpeg image does not have a transparency option, so any transparent areas will be rendered as black or white. Selecting tiff format will by default render the transparent areas transparent, but you can choose different options with the Settings button to include/exclude the alpha channel in different modes.
John
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rzwart2
Posts: 43
Location: Utrecht, Netherlands
Registered: 4 May 2008
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Re: problem with masking
Posted: 31 Jan 2010 at 13:58 GMT
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Thanx John, I belnd in photoshop after I have alligned different exposed images. Isn't that good enough?
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Vilmer
Posts: 445
Location: Argentina
Registered: 23 May 2007
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Re: problem with masking
Posted: 31 Jan 2010 at 14:25 GMT
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Are you sure you are using alpha channel and not just a layer mask?
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John Houghton
Posts: 3412
Location: Hitchin, United Kingdom
Registered: 17 Jan 2005
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Re: problem with masking
Posted: 31 Jan 2010 at 15:39 GMT
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rzwart2 said: Thanx John, I belnd in photoshop after I have alligned different exposed images. Isn't that good enough?
That may or may not give better results than Enfuse, but Enfuse is quicker. It depends on what results you want, how you want to spend your time, and your Photoshop skills.
John
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rzwart2
Posts: 43
Location: Utrecht, Netherlands
Registered: 4 May 2008
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Re: problem with masking
Posted: 31 Jan 2010 at 15:54 GMT
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I ordered Enfuse (lightroom plugin) cause I like some more speed in my workflow. Thanks for the tip!
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rzwart2
Posts: 43
Location: Utrecht, Netherlands
Registered: 4 May 2008
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Re: problem with masking
Posted: 31 Jan 2010 at 15:54 GMT
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Vilmer, I'm not adding a layermask.
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Hans Nyberg
Posts: 2760
Location: Denmark
Registered: 28 Aug 2005
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rzwart2
Posts: 43
Location: Utrecht, Netherlands
Registered: 4 May 2008
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Re: problem with masking
Posted: 31 Jan 2010 at 17:47 GMT
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John, do you mean the settings tab in Ptgui? I don't see one. The areas that ought to be transparant are black in Ptgui,
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John Houghton
Posts: 3412
Location: Hitchin, United Kingdom
Registered: 17 Jan 2005
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Re: problem with masking
Posted: 31 Jan 2010 at 17:56 GMT
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I mean everywhere the images are displayed: Source Images tab, Project Assistant, Panorama Editor, Image Parameters tab, Crop tab, Control points tab, ... etc. Email me an image so I can see what's going on. Resize it down to something reasonable. 4MB is not necessary.
John
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rzwart2
Posts: 43
Location: Utrecht, Netherlands
Registered: 4 May 2008
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Re: problem with masking
Posted: 31 Jan 2010 at 19:12 GMT
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John, I also send you files in the afternoon by yousendit.com
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Itamar Vieira
Posts: 32
Location: Brazil
Registered: 9 Mar 2010
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Re: problem with masking
Posted: 9 Mar 2010 at 3:15 GMT
updated: 9 Mar 2010 at 3:23 GMT
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Hi,
I'm having a similar problem. PTGui shows my image thumbnail with the mask perfectly, but it is completely transparent when warped and so it is in Panorama editor.
Print-Screen:
image0 is a JPEG with the Alpha-channel in PhotoShop, saved as TIFF.
image1 is another TIFF direct from the camera.
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