[erdas-l] RGB to greyscale in Erdas?
Natalie Parker
Does anyone know if it is posible to convert RGB images (.tif) into greyscale using erdas? For some reason I can't open the images in any other software package e.g. corel to covert them there.
Thanks
Natalie
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msd
Hello If I undstand you well, you can do this by importing your image to Erdas, through Import from main menu, after import you can select grayscale from display option in raster option ~in the viewer file menu. |
From: Natalie Parker <nop...@bham.ac.uk> |
Hello, Does anyone know if it is posible to convert RGB images (.tif) into greyscale using erdas? For some reason I can't open the images in any other software package e.g. corel to covert them there. Thanks Natalie --- You are currently subscribed to erdas-l as: mohmedsal...@yahoo.com. To unsubscribe send a blank email to leave-29819223-62535365.ddf8...@lyris.dundee.net |
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Fairuz Mohamad
A journey of thousand miles starts with one step.Good judgement comes from experience and experience comes from bad judgement.."pacat" From: msd <mohmedsal...@yahoo.com>
To: ERDAS Discussion List <erd...@lyris.dundee.net>
Sent: Sunday, June 29, 2008 8:59:54 PM
Subject: Re: [erdas-l] RGB to greyscale in Erdas?
Hello If I undstand you well, you can do this by importing your image to Erdas, through Import from main menu, after import you can select grayscale from display option in raster option ~in the viewer file menu. From: Natalie Parker <nop...@bham.ac.uk> |
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Hütter Rudolf
Natalie,
use Import/Export --> Export (TIFF). Select both input and output files and proceede with OK. Select "Export band selection" --> Grayscale (and all other parameters You intend to have) --> OK.
This should work!
Good luck,
Rudolf
Rudolf L. Hütter
c/o
GIS - Province of Styria
Tel.: +43 316 877 3650
FAX: +43 316 877 2067
URL: http://www.gis.steiermark.at
A-8010 Graz
Austria - Europe
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-----Ursprüngliche Nachricht-----
Von: Natalie Parker [mailto:nop...@bham.ac.uk]
Gesendet: Sonntag, 29. Juni 2008 13:52
An: ERDAS Discussion List
Betreff: [erdas-l] RGB to greyscale in Erdas?
Hello,
Does anyone know if it is posible to convert RGB images (.tif) into greyscale using erdas? For some reason I can't open the images in any other software package e.g. corel to covert them there.
Thanks
Natalie
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Adrian Benitez
You can use IMAGE INTERPRETER/SPECTRAL ENHANCEMENT/RGB to IHS.
Then extract the first band (IMAGE INTERPRETER/UTILITIES/SUBSET) from the IHS image.
If you prefer, you can rescale the last product to 8 bits using IMAGE INTERPRETER/UTILITIES/RESCALE
To get more SD, you can use PRINCIPAL COMPONENTS, instead of RGB to IHS. But you will loose some standart model reference.
Adrian E. Benítez
Responsable Geographic Imaging, Aeroterra S.A.
Argentina
-----Mensaje original-----
De: Natalie Parker [mailto:nop...@bham.ac.uk]
Enviado el: Domingo, 29 de Junio de 2008 08:52 a.m.
Para: ERDAS Discussion List
Asunto: [erdas-l] RGB to greyscale in Erdas?
Hello,
Does anyone know if it is posible to convert RGB images (.tif) into greyscale using erdas? For some reason I can't open the images in any other software package e.g. corel to covert them there.
Thanks
Natalie
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Stefana Popova
Please note that export to grayscale is the same as viewer greyscale - you have information from a single band!
RGB to Greyscale is rather a transformation of a combination of 3 channels to grayscale palette.
Thus, Adrian gives the right suggestions.
Photoshop's method can be applied with spatial modeler.
PS uses 59% for the green, 30% of the red and 11% for the blue channels for conversion factors
or
<grayscale>=0.59*G+0.3*R+0.11*R
Other technique is the saturation removal - to compute the desaturated image you actually compute the lightness component (intensity) - I guess more or less like the IHS method.
L=[max(R,G,B)+min(R,G,B)]/2
however this result has poor contrast
--
Stefana Popova
~ ~ ~ ~ ~ ~ ~ ~ ~
ReSAC - Bulgaria
www.resac-bg.org
~ ~ ~ ~ ~ ~ ~ ~ ~
EML & Spatial Modeling Forum Moderator
http://developer.lggi.com
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Natalie Parker
Thank you very much for all your help everyone!
Natalie
________________________________
From: Stefana Popova [stef...@gmail.com]
Sent: 01 July 2008 10:45
To: ERDAS Discussion List
Subject: Re: [erdas-l] RGB to greyscale in Erdas?
Listers,
Please note that export to grayscale is the same as viewer greyscale - you have information from a single band!
RGB to Greyscale is rather a transformation of a combination of 3 channels to grayscale palette.
Thus, Adrian gives the right suggestions.
Photoshop's method can be applied with spatial modeler.
PS uses 59% for the green, 30% of the red and 11% for the blue channels for conversion factors
or
<grayscale>=0.59*G+0.3*R+0.11*R
Other technique is the saturation removal - to compute the desaturated image you actually compute the lightness component (intensity) - I guess more or less like the IHS method.
L=[max(R,G,B)+min(R,G,B)]/2
however this result has poor contrast
--
Stefana Popova
~ ~ ~ ~ ~ ~ ~ ~ ~
ReSAC - Bulgaria
www.resac-bg.org<http://www.resac-bg.org>
~ ~ ~ ~ ~ ~ ~ ~ ~
EML & Spatial Modeling Forum Moderator
http://developer.lggi.com
On Mon, Jun 30, 2008 at 3:57 PM, Adrian Benitez <aben...@aeroterra.com<mailto:aben...@aeroterra.com>> wrote:
Yes Natalie.
You can use IMAGE INTERPRETER/SPECTRAL ENHANCEMENT/RGB to IHS.
Then extract the first band (IMAGE INTERPRETER/UTILITIES/SUBSET) from the IHS image.
If you prefer, you can rescale the last product to 8 bits using IMAGE INTERPRETER/UTILITIES/RESCALE
To get more SD, you can use PRINCIPAL COMPONENTS, instead of RGB to IHS. But you will loose some standart model reference.
Adrian E. Benítez
Responsable Geographic Imaging, Aeroterra S.A.
Argentina
-----Mensaje original-----
De: Natalie Parker [mailto:nop...@bham.ac.uk<mailto:nop...@bham.ac.uk>]
Enviado el: Domingo, 29 de Junio de 2008 08:52 a.m.
Para: ERDAS Discussion List
Asunto: [erdas-l] RGB to greyscale in Erdas?
Hello,
Does anyone know if it is posible to convert RGB images (.tif) into greyscale using erdas? For some reason I can't open the images in any other software package e.g. corel to covert them there.
Thanks
Natalie
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