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Re: Making Color bar from Density Slice [message #72523]

Fri, 17 September 2010 07:32

kamal
Messages: 12
Registered: June 2010

Junior Member

> I'm not completely sure what you're doing but in ENVI 4.5 at least you
> can import a Colour table from an ASCII file in the ENVI Color Table
> (see File - Preferences -Display Defaults - Edit System color tables)
>
> Max

Thank you Max for your reply.
What I want to do is actually give colors to a ice surface temp image.
The actual temp range is from 230 to 310(K). But I'd like to give an
interval of 3K and segment the range up to 271K with the last segment
taking color for temp range beyond 271K also. I did this using the
Density Slice in ENVI. Now the problem is I have given some other
values to Land and Cloud pixels, to be precise 50.00 and 25.00
respectively. What a actually want to do is to plot the color bar such
that the range starts from 230K and goes up to 271K omitting the
ranges below 230K. I'm trying this using the Color Ramp in Annotation
option in Overlay. Whenever I give the Min value of 230K it will take
it as the lowest value but the color will not change accordingly. I am
attaching the structure of the Density Slice I'm using to give the
colors to different temp ranges. Please help me out.

ENVI Density Slice Range File
0.00000000 0.00000000 255 255 255
25.000000 25.000000 212 230 225
50.000000 50.000000 255 0 0
230.00000 250.00000 163 242 252
250.00000 253.00000 195 230 253
253.00000 256.00000 138 205 248
256.00000 259.00000 72 182 254
259.00000 262.00000 2 133 243
262.00000 265.00000 3 84 202
265.00000 268.00000 0 39 162
268.00000 271.00000 2 0 78
271.00000 310.00000 198 198 198

The 0 values denote NoData pixels.
I hope somebody will kindly get me some solution in this.
Thnx agan

Kamal

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Re: Making Color bar from Density Slice [message #72530 is a reply to message #72523]

Thu, 16 September 2010 23:36

Maxwell Peck
Messages: 61
Registered: February 2010

Member

On Sep 17, 5:37 am, kamal <kamaljit.rajku...@gmail.com> wrote:
> Hi all,
>
> In ENVI4.2, I would like to know if there is any way whatsoever to
> plot the colors in Density Slice as the color bar in the image plot
> itself? We can plot the color bar from ENVI Color Tables using
> Annotation but can the same be done using Density Slice? Or is there a
> way to define our own custom color tables and import them in to ENVI
> Color Tables? Please let me know.
>
> Thank you in advance.
>
> Kamal

I'm not completely sure what you're doing but in ENVI 4.5 at least you
can import a Colour table from an ASCII file in the ENVI Color Table
(see File - Preferences -Display Defaults - Edit System color tables)

Max

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Re: Making Color bar from Density Slice [message #72649 is a reply to message #72523]

Tue, 21 September 2010 05:11

kamal
Messages: 12
Registered: June 2010

Junior Member

On Sep 17, 7:32 pm, kamal <kamaljit.rajku...@gmail.com> wrote:
>> I'm not completely sure what you're doing but in ENVI 4.5 at least you
>> can import a Colour table from an ASCII file in the ENVI Color Table
>> (see File - Preferences -Display Defaults - Edit System color tables)
>
>> Max
>
> Thank you Max for your reply.
> What I want to do is actually give colors to a ice surface temp image.
> The actual temp range is from 230 to 310(K). But I'd like to give an
> interval of 3K and segment the range up to 271K with the last segment
> taking color for temp range beyond 271K also. I did this using the
> Density Slice in ENVI. Now the problem is I have given some other
> values to Land and Cloud pixels, to be precise 50.00 and 25.00
> respectively. What a actually want to do is to plot the color bar such
> that the range starts from 230K and goes up to 271K omitting the
> ranges below 230K. I'm trying this using the Color Ramp in Annotation
> option in Overlay. Whenever I give the Min value of 230K it will take
> it as the lowest value but the color will not change accordingly. I am
> attaching the structure of the Density Slice I'm using to give the
> colors to different temp ranges. Please help me out.
>
> ENVI Density Slice Range File
> 0.00000000 0.00000000 255 255 255
> 25.000000 25.000000 212 230 225
> 50.000000 50.000000 255 0 0
> 230.00000 250.00000 163 242 252
> 250.00000 253.00000 195 230 253
> 253.00000 256.00000 138 205 248
> 256.00000 259.00000 72 182 254
> 259.00000 262.00000 2 133 243
> 262.00000 265.00000 3 84 202
> 265.00000 268.00000 0 39 162
> 268.00000 271.00000 2 0 78
> 271.00000 310.00000 198 198 198
>
> The 0 values denote NoData pixels.
> I hope somebody will kindly get me some solution in this.
> Thnx agan
>
> Kamal

Solved! It was quite easy and was there in Annotation itself.

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