Understanding raster custom transparency options (making null data 100% transparent) in QGIS? ...
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Understanding raster custom transparency options (making null data 100% transparent) in QGIS?
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I have a raster with a large null area (see the solid black area in the image below). The "Band 1" value throughout this null area is -3.402823e+38.
I'm trying to make sense of the result of my setting the "custom transparency options" so that "Band 1" values from 0 to 0 are 100% transparent (see settings below). Please note that at no point am I making changes to the default Style properties of the raster.
As a result of these settings, the null area does become transparent but the rest of the raster now has strange banding (see result below). My expectation was that the only visual difference between the initial raster and the result raster would be 100% transparency in the null area.
Am I missing something?
EDIT: Per request, here are the the Style settings:
And I have set '0' as an Additional no data value, as shown below.
I have further discovered that I achieve the same strange banded raster result even if I delete the custom 0 to 0, 100% transparency option. To achieve this strange banded raster, I only need to select "Band 1" as the transparency band as shown below.
qgis raster transparency null
asked Mar 25 '18 at 18:33
Mike EMike E
362
bumped to the homepage by Community♦ 22 mins ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
add a comment |
I have a raster with a large null area (see the solid black area in the image below). The "Band 1" value throughout this null area is -3.402823e+38.
I'm trying to make sense of the result of my setting the "custom transparency options" so that "Band 1" values from 0 to 0 are 100% transparent (see settings below). Please note that at no point am I making changes to the default Style properties of the raster.
As a result of these settings, the null area does become transparent but the rest of the raster now has strange banding (see result below). My expectation was that the only visual difference between the initial raster and the result raster would be 100% transparency in the null area.
Am I missing something?
EDIT: Per request, here are the the Style settings:
And I have set '0' as an Additional no data value, as shown below.
I have further discovered that I achieve the same strange banded raster result even if I delete the custom 0 to 0, 100% transparency option. To achieve this strange banded raster, I only need to select "Band 1" as the transparency band as shown below.
qgis raster transparency null
asked Mar 25 '18 at 18:33
Mike EMike E
362
bumped to the homepage by Community♦ 22 mins ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
You have to show and style manager window. This is very strange result
– nagib
Mar 25 '18 at 19:29
Try typing 0 in Additional no data value.
– Techie_Gus
Mar 25 '18 at 20:55
I edited the Question in response to the above comments.
– Mike E
Mar 25 '18 at 23:49
1
I think your last line in the Edit is the perfect answer to your question. The band selected forTransparency bandis treated as the alpha band (as in RGBA composite images) to control the transparency.
– Kazuhito
Mar 26 '18 at 0:31
I don't quite follow you. Which settings do you propose I alter so that the null/"no data" region is 100% transparent and the other values maintain their typical black-to-white coloring without the banding?
– Mike E
Mar 26 '18 at 2:06
add a comment |
I have a raster with a large null area (see the solid black area in the image below). The "Band 1" value throughout this null area is -3.402823e+38.
I'm trying to make sense of the result of my setting the "custom transparency options" so that "Band 1" values from 0 to 0 are 100% transparent (see settings below). Please note that at no point am I making changes to the default Style properties of the raster.
As a result of these settings, the null area does become transparent but the rest of the raster now has strange banding (see result below). My expectation was that the only visual difference between the initial raster and the result raster would be 100% transparency in the null area.
Am I missing something?
EDIT: Per request, here are the the Style settings:
And I have set '0' as an Additional no data value, as shown below.
I have further discovered that I achieve the same strange banded raster result even if I delete the custom 0 to 0, 100% transparency option. To achieve this strange banded raster, I only need to select "Band 1" as the transparency band as shown below.
qgis raster transparency null
asked Mar 25 '18 at 18:33
Mike EMike E
362
I have a raster with a large null area (see the solid black area in the image below). The "Band 1" value throughout this null area is -3.402823e+38.
I'm trying to make sense of the result of my setting the "custom transparency options" so that "Band 1" values from 0 to 0 are 100% transparent (see settings below). Please note that at no point am I making changes to the default Style properties of the raster.
As a result of these settings, the null area does become transparent but the rest of the raster now has strange banding (see result below). My expectation was that the only visual difference between the initial raster and the result raster would be 100% transparency in the null area.
Am I missing something?
EDIT: Per request, here are the the Style settings:
And I have set '0' as an Additional no data value, as shown below.
I have further discovered that I achieve the same strange banded raster result even if I delete the custom 0 to 0, 100% transparency option. To achieve this strange banded raster, I only need to select "Band 1" as the transparency band as shown below.
qgis raster transparency null
qgis raster transparency null
asked Mar 25 '18 at 18:33
Mike EMike E
362
asked Mar 25 '18 at 18:33
Mike EMike E
362
edited Mar 25 '18 at 23:49
Mike E
asked Mar 25 '18 at 18:33
Mike EMike E
362
asked Mar 25 '18 at 18:33
Mike EMike E
362
asked Mar 25 '18 at 18:33
Mike EMike E
362
362
bumped to the homepage by Community♦ 22 mins ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
bumped to the homepage by Community♦ 22 mins ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
You have to show and style manager window. This is very strange result
– nagib
Mar 25 '18 at 19:29
Try typing 0 in Additional no data value.
– Techie_Gus
Mar 25 '18 at 20:55
I edited the Question in response to the above comments.
– Mike E
Mar 25 '18 at 23:49
1
I think your last line in the Edit is the perfect answer to your question. The band selected forTransparency bandis treated as the alpha band (as in RGBA composite images) to control the transparency.
– Kazuhito
Mar 26 '18 at 0:31
I don't quite follow you. Which settings do you propose I alter so that the null/"no data" region is 100% transparent and the other values maintain their typical black-to-white coloring without the banding?
– Mike E
Mar 26 '18 at 2:06
add a comment |
You have to show and style manager window. This is very strange result
– nagib
Mar 25 '18 at 19:29
Try typing 0 in Additional no data value.
– Techie_Gus
Mar 25 '18 at 20:55
I edited the Question in response to the above comments.
– Mike E
Mar 25 '18 at 23:49
1
I think your last line in the Edit is the perfect answer to your question. The band selected forTransparency bandis treated as the alpha band (as in RGBA composite images) to control the transparency.
– Kazuhito
Mar 26 '18 at 0:31
I don't quite follow you. Which settings do you propose I alter so that the null/"no data" region is 100% transparent and the other values maintain their typical black-to-white coloring without the banding?
– Mike E
Mar 26 '18 at 2:06
You have to show and style manager window. This is very strange result
– nagib
Mar 25 '18 at 19:29
You have to show and style manager window. This is very strange result
– nagib
Mar 25 '18 at 19:29
Try typing 0 in Additional no data value.
– Techie_Gus
Mar 25 '18 at 20:55
Try typing 0 in Additional no data value.
– Techie_Gus
Mar 25 '18 at 20:55
I edited the Question in response to the above comments.
– Mike E
Mar 25 '18 at 23:49
I edited the Question in response to the above comments.
– Mike E
Mar 25 '18 at 23:49
1
1
I think your last line in the Edit is the perfect answer to your question. The band selected for
Transparency band is treated as the alpha band (as in RGBA composite images) to control the transparency.– Kazuhito
Mar 26 '18 at 0:31
I think your last line in the Edit is the perfect answer to your question. The band selected for
Transparency band is treated as the alpha band (as in RGBA composite images) to control the transparency.– Kazuhito
Mar 26 '18 at 0:31
I don't quite follow you. Which settings do you propose I alter so that the null/"no data" region is 100% transparent and the other values maintain their typical black-to-white coloring without the banding?
– Mike E
Mar 26 '18 at 2:06
I don't quite follow you. Which settings do you propose I alter so that the null/"no data" region is 100% transparent and the other values maintain their typical black-to-white coloring without the banding?
– Mike E
Mar 26 '18 at 2:06
add a comment |
1 Answer
1
active
oldest
votes
To set the transparency, all you have to do is what you did without setting the transparency band to band 1, i.e. leave it on "None"
For example, to make the ocean bathymetry transparent in this elevation layer:
Set the range you want (0 - 0 in your case, -11000 - 0 in mine) and leave the transparency band alone.
answered Oct 16 '18 at 19:55
Peter HanleyPeter Hanley
18315
(I'm pretty much telling you what @kazuhito was telling you above, just explaining in a little more detail.)
– Peter Hanley
Oct 16 '18 at 19:57
add a comment |
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1 Answer
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1 Answer
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To set the transparency, all you have to do is what you did without setting the transparency band to band 1, i.e. leave it on "None"
For example, to make the ocean bathymetry transparent in this elevation layer:
Set the range you want (0 - 0 in your case, -11000 - 0 in mine) and leave the transparency band alone.
answered Oct 16 '18 at 19:55
Peter HanleyPeter Hanley
18315
(I'm pretty much telling you what @kazuhito was telling you above, just explaining in a little more detail.)
– Peter Hanley
Oct 16 '18 at 19:57
add a comment |
To set the transparency, all you have to do is what you did without setting the transparency band to band 1, i.e. leave it on "None"
For example, to make the ocean bathymetry transparent in this elevation layer:
Set the range you want (0 - 0 in your case, -11000 - 0 in mine) and leave the transparency band alone.
answered Oct 16 '18 at 19:55
Peter HanleyPeter Hanley
18315
(I'm pretty much telling you what @kazuhito was telling you above, just explaining in a little more detail.)
– Peter Hanley
Oct 16 '18 at 19:57
add a comment |
To set the transparency, all you have to do is what you did without setting the transparency band to band 1, i.e. leave it on "None"
For example, to make the ocean bathymetry transparent in this elevation layer:
Set the range you want (0 - 0 in your case, -11000 - 0 in mine) and leave the transparency band alone.
answered Oct 16 '18 at 19:55
Peter HanleyPeter Hanley
18315
To set the transparency, all you have to do is what you did without setting the transparency band to band 1, i.e. leave it on "None"
For example, to make the ocean bathymetry transparent in this elevation layer:
Set the range you want (0 - 0 in your case, -11000 - 0 in mine) and leave the transparency band alone.
answered Oct 16 '18 at 19:55
Peter HanleyPeter Hanley
18315
answered Oct 16 '18 at 19:55
Peter HanleyPeter Hanley
18315
answered Oct 16 '18 at 19:55
Peter HanleyPeter Hanley
18315
answered Oct 16 '18 at 19:55
Peter HanleyPeter Hanley
18315
18315
(I'm pretty much telling you what @kazuhito was telling you above, just explaining in a little more detail.)
– Peter Hanley
Oct 16 '18 at 19:57
add a comment |
(I'm pretty much telling you what @kazuhito was telling you above, just explaining in a little more detail.)
– Peter Hanley
Oct 16 '18 at 19:57
(I'm pretty much telling you what @kazuhito was telling you above, just explaining in a little more detail.)
– Peter Hanley
Oct 16 '18 at 19:57
(I'm pretty much telling you what @kazuhito was telling you above, just explaining in a little more detail.)
– Peter Hanley
Oct 16 '18 at 19:57
add a comment |
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You have to show and style manager window. This is very strange result
– nagib
Mar 25 '18 at 19:29
Try typing 0 in Additional no data value.
– Techie_Gus
Mar 25 '18 at 20:55
I edited the Question in response to the above comments.
– Mike E
Mar 25 '18 at 23:49
1
I think your last line in the Edit is the perfect answer to your question. The band selected for
Transparency bandis treated as the alpha band (as in RGBA composite images) to control the transparency.– Kazuhito
Mar 26 '18 at 0:31
I don't quite follow you. Which settings do you propose I alter so that the null/"no data" region is 100% transparent and the other values maintain their typical black-to-white coloring without the banding?
– Mike E
Mar 26 '18 at 2:06