Le 01/06/2023 à 20:39, Laurențiu Nicola via gdal-dev a écrit :
Hello,
Just a quick question: can block offsets (such as those in in
GDALReadBlock or IRasterIO) ever be negative?
No, this isn't allowed.
Is there any format that supports that?
No
GDAL uses signed integers everywhere, whic
Hello,
Just a quick question: can block offsets (such as those in in GDALReadBlock or
IRasterIO) ever be negative? Is there any format that supports that?
GDAL uses signed integers everywhere, which is fine, but the intention isn't
always clear at times.
Thanks,
Laurentiu Nicola___
Hi,
Try saving the output into a new file. Those are "creation options".
Laurentiu
On Thu, Jun 1, 2023, at 20:34, afernandez wrote:
> Hello Laurentiu,
> The color palette is working fine. The issues seem to be caused by using
> UInt16 because I changed to GDT_Byte per your suggestion and everyt
Hi Arturo,
On Thu, Jun 1, 2023, at 20:41, afernandez wrote:
> Hi Scott,
> As I mentioned to Laurentiu, I'm still not getting the handle on how to use
> overviews but will keep working at it.
You don't need to do anything except create them. QGIS will use them
automatically, for example (make s
Hello Laurentiu,
The color palette is working fine. The issues seem to be caused by using UInt16
because I changed to GDT_Byte per your suggestion and everything is so much
smoother (this was an oversight of mine as I recycled a snippet from somewhere
and should have paid much closer attention t
import os
os.system([gdal command here])
On 6/1/23 10:41, afernandez wrote:
Hi Scott,
As I mentioned to Laurentiu, I'm still not getting the handle on how to
use overviews but will keep working at it. However, this is only useful
to me (and probably to other people) if they can be used from
Hi Scott,
As I mentioned to Laurentiu, I'm still not getting the handle on how to use
overviews but will keep working at it. However, this is only useful to me
(and probably to other people) if they can be used from a python script,
not from the OS.
Thanks,
Arturo
Scott wrote:
As a test you can sk
As a test you can skip the whole python debacle and try this:
gdal_translate -f COG -co COMPRESS=DEFLATE -scale 0 255 -ot Byte
source.tif target.tif
On 6/1/23 07:35, afernandez wrote:
Hello,
I'm generating a raster file with GDAL. The pseudo-code (where the
raster is loaded as 'var') for th
Hi,
There are a couple of things you can try:
• you seem to be scaling the data to 8-bit, but saving it as UInt16; GDT_Byte
should work, yielding a 50% reduction. I didn't quite understand the comment
about the color, does the palette not work with 8-bit images?
• you can enable and tune compr
Hello,
I'm generating a raster file with GDAL. The pseudo-code (where the raster
is loaded as 'var') for the colored version reads:
# Initial manipulations
dims = var.dimensions
shape = var.shape
driver_name = 'GTIFF'
driver = gdal.GetDriverByName(driver_name)
np_dtype = var.dtype
type_code = gdal
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