1CH Image Read as 3CH

[5had3z]

Version

0.3.0.5

Describe the bug.

When reading an 1ch 8bit image, nvimgcodec returns a 3ch 8bit image. OpenCV has the same behaviour when not specifying a format. When specifying flagging IMREAD_UNCHANGED it reads as 1ch. PIL reads correctly by default.

Minimum reproducible example

#!/usr/bin/env python3
from pathlib import Path
import numpy as np
from PIL import Image
from nvidia import nvimgcodec

test_file = Path("test_im.png")
size = (512, 512)
im_data = np.random.uniform(0, 255, size=size).astype(np.uint8)
print(f"Saving image with {im_data.shape=}")
Image.fromarray(im_data).save(test_file)

decoder = nvimgcodec.Decoder()
nv_img = decoder.decode(test_file.read_bytes())

print(f"NV image with {nv_img.shape=}")

import cv2

cv_img = cv2.imread(str(test_file))
print(f"CV default image with {cv_img.shape=}")

cv_img = cv2.imread(str(test_file), cv2.IMREAD_UNCHANGED)
print(f"CV unchanged image with {cv_img.shape=}")

pil_image = Image.open(test_file)
print(f"PIL default image with {pil_image.size=}")

Environment details

<details><summary>Click here to see environment details</summary><pre>
     
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     ***GPU Information***
     Mon Aug 26 22:22:57 2024
     +-----------------------------------------------------------------------------------------+
     | NVIDIA-SMI 560.28.03              Driver Version: 560.28.03      CUDA Version: 12.6     |
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     |                                         |                        |               MIG M. |
     |=========================================+========================+======================|
     |   0  NVIDIA GeForce RTX 3090        Off |   00000000:0B:00.0  On |                  N/A |
     | 63%   45C    P0            129W /  370W |     891MiB /  24576MiB |      0%      Default |
     |                                         |                        |                  N/A |
     +-----------------------------------------+------------------------+----------------------+
     
     +-----------------------------------------------------------------------------------------+
     | Processes:                                                                              |
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     |        ID   ID                                                               Usage      |
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     +-----------------------------------------------------------------------------------------+
     
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     Vulnerability Itlb multihit:          Not affected
     Vulnerability L1tf:                   Not affected
     Vulnerability Mds:                    Not affected
     Vulnerability Meltdown:               Not affected
     Vulnerability Mmio stale data:        Not affected
     Vulnerability Reg file data sampling: Not affected
     Vulnerability Retbleed:               Not affected
     Vulnerability Spec rstack overflow:   Mitigation; Safe RET
     Vulnerability Spec store bypass:      Mitigation; Speculative Store Bypass disabled via prctl
     Vulnerability Spectre v1:             Mitigation; usercopy/swapgs barriers and __user pointer sanitization
     Vulnerability Spectre v2:             Mitigation; Retpolines; IBPB conditional; IBRS_FW; STIBP always-on; RSB filling; PBRSB-eIBRS Not affected; BHI Not affected
     Vulnerability Srbds:                  Not affected
     Vulnerability Tsx async abort:        Not affected
     
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     Cuda compilation tools, release 12.6, V12.6.20
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     ubuntu-drivers-common                    0.0.0
     ubuntu-pro-client                        8001
     ufw                                      0.36.1
     unattended-upgrades                      0.1
     urllib3                                  1.26.16
     userpath                                 1.8.0
     uvicorn                                  0.23.2
     virtualenv                               20.21.0
     visu3d                                   1.5.1
     wadllib                                  1.3.6
     watchfiles                               0.21.0
     wcwidth                                  0.2.6
     webencodings                             0.5.1
     websocket-client                         1.6.4
     websockets                               11.0.3
     Werkzeug                                 2.2.3
     wheel                                    0.37.1
     wrapt                                    1.15.0
     xdg                                      5
     xgboost                                  2.0.3
     xkit                                     0.0.0
     xyzservices                              2023.7.0
     yacs                                     0.1.8
     yarl                                     1.9.2
     zarr                                     2.16.0
     zipp                                     1.0.0
     
</pre></details>

Relevant log output

Example output of the "Minimum reproducible example"

Saving image with im_data.shape=(512, 512)
NV image with nv_img.shape=(512, 512, 3)
CV default image with cv_img.shape=(512, 512, 3)
CV unchanged image with cv_img.shape=(512, 512)
PIL default image with pil_image.size=(512, 512)

Other/Misc.

No response

Check for duplicates

• I have searched the open bugs/issues and have found no duplicates for this bug report

[5had3z]

That is some crazy scam link genration spam. GH needs to get it together lmao.

[jantonguirao]

It is our intention to provide 3ch by default (even if the input is 1-channel), unless specified to decode to grayscale. However, we should probably decode the original number of channels when UNCHANGED is selected. Would that behaviour be OK for you?

[5had3z]

Since this is a new library and version <1, would it be possible to change defaults to UNCHANGED (and unchanged to keep the same ch/bit depth) to minimize suprise? I don't think silent implicit conversion from one format to another should be desired behaviour.