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+--- Thread: Trying to import a 16-bit grayscale .dds (heightmap) without converting to 8-bit (/Thread-Trying-to-import-a-16-bit-grayscale-dds-heightmap-without-converting-to-8-bit)
Trying to import a 16-bit grayscale .dds (heightmap) without converting to 8-bit - mikusingularity - 09-24-2020
I am trying to modify a 8192 x 4096 16-bit .dds heightmap of the Earth, but whenever I import it, it always converts to 8-bit. Is there any way I can import without it becoming 8-bit? Or if GIMP cannot do that, which program can?
RE: Trying to import a 16-bit grayscale .dds (heightmap) without converting to 8-bit - rich2005 - 09-25-2020
Can you post a link to one of these files, the only example dds I have is 8 bit (per channel) as reported by ImageMagick and a search only brings up the same.
RE: Trying to import a 16-bit grayscale .dds (heightmap) without converting to 8-bit - bram - 11-18-2020
(09-25-2020, 07:57 AM)rich2005 Wrote: Can you post a link to one of these files, the only example dds I have is 8 bit (per channel) as reported by ImageMagick and a search only brings up the same.
I have the same issue.
I created my image with this header:
Code:
DDS_PIXELFORMAT pf =
{
32, // SIZE
0x20000, // DDPF_LUMINANCE
0, // FOUR CC
16, // RGB BIT COUNT
0x0000ffff, // R BIT MASK
0, // G BIT MASK
0, // B BIT MASK
0, // A BIT MASK
};
DDS_HEADER header =
{
124, // SIZE
0x1 | 0x2 | 0x4 | 0x1000, // FLAGS
imh, imw, // HEIGHT,WIDTH
0,0,0, // PITCH,DEPTH,MIPMAP
{ 0,0,0,0,0,0,0,0,0,0,0, }, // RESERVED
pf, // PIXEL FORMAT
0x1000, // CAPS
0, // CAPS2
0, // CAPS3
0, // CAPS4
0, // RESERVED
};Here's an example 16 bit luminosity file, I created:
https://stolk.org/tmp/out.dds
RE: Trying to import a 16-bit grayscale .dds (heightmap) without converting to 8-bit - rich2005 - 11-19-2020
No further forward here. Still opens in Gimp as 8 bit and ImageMagick also thinks it is 8 bit.
Code:
Image:
Filename: out.dds
Format: DDS (Microsoft DirectDraw Surface)
Class: DirectClass
Geometry: 1024x1024+0+0
Units: Undefined
Colorspace: sRGB
Type: Bilevel
Base type: Undefined
Endianness: LSB
Depth: 8/1-bit
Channel depth:
Red: 1-bit
Green: 1-bit
Blue: 1-bit
Channel statistics:
Pixels: 1048576
Red:
min: 255 (1)
max: 255 (1)
mean: 255 (1)
standard deviation: 0 (0)
kurtosis: 8.192e+51
skewness: 1e+36
entropy: 0
Green:
min: 255 (1)
max: 255 (1)
mean: 255 (1)
standard deviation: 0 (0)
kurtosis: 8.192e+51
skewness: 1e+36
entropy: 0
Blue:
min: 255 (1)
max: 255 (1)
mean: 255 (1)
standard deviation: 0 (0)
kurtosis: 8.192e+51
skewness: 1e+36
entropy: 0
Image statistics:
Overall:
min: 255 (1)
max: 255 (1)
mean: 255 (1)
standard deviation: 0 (0)
kurtosis: -2.86314e+57
skewness: 4.36886e+40
entropy: 0
Colors: 1
Histogram:
1.04858e+06: (255,255,255) #FFFFFF white
Rendering intent: Perceptual
Gamma: 0.454545
Chromaticity:
red primary: (0.64,0.33)
green primary: (0.3,0.6)
blue primary: (0.15,0.06)
white point: (0.3127,0.329)
Matte color: grey74
Background color: white
Border color: srgb(223,223,223)
Transparent color: none
Interlace: None
Intensity: Undefined
Compose: Over
Page geometry: 1024x1024+0+0
Dispose: Undefined
Iterations: 0
Compression: None
Orientation: Undefined
Properties:
date:create: 2020-11-19T08:18:22+00:00
date:modify: 2020-11-19T08:18:22+00:00
signature: 7ce0ffd942046e8bac1f3445cb712b65665c26278b4884ff49918c5e16a9da29
Artifacts:
verbose: true
Tainted: False
Filesize: 2097280B
Number pixels: 1.04858M
Pixels per second: 145.135MP
User time: 0.010u
Elapsed time: 0:01.007
Version: ImageMagick 7.0.10-21 Q16 x86_64 2020-06-27 https://imagemagick.orgRE: Trying to import a 16-bit grayscale .dds (heightmap) without converting to 8-bit - bram - 11-19-2020
(11-19-2020, 01:22 PM)rich2005 Wrote: No further forward here. Still opens in Gimp as 8 bit and ImageMagick also thinks it is 8 bit.
I think both ImageMagick and Gimp are mistaken.
Code:
$ sudo apt install libnvtt-binCode:
$ nvddsinfo out.dds
Flags: 0x00001007
DDSD_CAPS
DDSD_PIXELFORMAT
DDSD_WIDTH
DDSD_HEIGHT
Height: 1024
Width: 1024
Depth: 0
Mipmap count: 0
Pixel Format:
Flags: 0x00020000
FourCC: ''
Bit count: 16
Red mask: 0x0000FFFF
Green mask: 0x00000000
Blue mask: 0x00000000
Alpha mask: 0x00000000
Caps:
Caps 1: 0x00001000
DDSCAPS_TEXTURE
Caps 2: 0x00000000
Caps 3: 0x00000000
Caps 4: 0x00000000It clearly states: bitcount 16, and mask 0x0000ffff
Additionally, Ubuntu's 'file' command also correctly identifies it!
Code:
$ file ./out.dds
./out.dds: Microsoft DirectDraw Surface (DDS): 1024 x 1024, 16-bit color, luminanceRE: Trying to import a 16-bit grayscale .dds (heightmap) without converting to 8-bit - bram - 11-19-2020
Let me note further that this is a DDS specific bug, as PGM images 16 bit deep, are correctly loaded by GIMP with 16 bit precision.
RE: Trying to import a 16-bit grayscale .dds (heightmap) without converting to 8-bit - rich2005 - 11-19-2020
Yeah, looks like not supported by Gimp.
Since the dds plugin is now incorporated in Gimp 2.10 you can report this as a bug to
https://gitlab.gnome.org/GNOME/gimp/-/issues