Torch tensor to pil image to_tensor(img) Dec 7, 2022 · PIL：使用python自带图像处理库读取出来的图片格式 numpy：使用python-opencv库读取出来的图片格式 tensor：pytorch中训练时所采取的向量格式（当然也可以说图片） PIL与Tensor相互转换 import torch from PIL import Image import matplotlib. ToPILImage ([mode]) Convert a tensor or an ndarray to PIL Image PIL Image; Numpy Array Image; PyTorch Tensor Image; 1. See ToPILImage for more details. jpg")` where the postprocess_image() executes some post processing operation, say, unnormalizing. If omitted, will be inferred from data. imread('Penguins. open ("test. to (device, torch. Define a torch tensor of shape [C, H, W]. Feb 20, 2025 · Pytorch中Tensor与各种图像格式的相互转化详解 前言 在pytorch中经常会遇到图像格式的转化,例如将PIL库读取出来的图片转化为Tensor,亦或者将Tensor转化为numpy格式的图片. png") # 查看shape print (np. open ('sample_image. rand(3,256,256) Define a transform to convert the torch tensor to PIL image. 格式转换过程 from PIL import Image import numpy as np import matplotlib. Here is an example of how to save a tensor as an image in PyTorch: python import torch import torchvision import torchvision. transform = transforms. pyplot as plt # サンプル画像の読み込み image = Image. Compose([ transforms Convert a tensor, ndarray, or PIL Image to Image; this does not scale values. ToTensor()(image) # テンソルデータをPillow画像に変換 pil_image = transforms. Oct 19, 2022 · 目的PyTorchで画像等を扱っていると、Tensor、Numpy、PIL imageのそれぞれの形式に変換したい場合が多々ある。ここでは、備忘録としてそれぞれの形式に対する相互変換方法を示す。各データ形式の特… Feb 26, 2021 · 3. This tutorial shows how to do that using Python. shape) # 得到 (936, 1809, 4)，如果要转化成神经网络可读的格式，我们要转化成(4,936,1809) transformOper = transforms. Normalize(mean,std)可以进行想要的归一化 from PIL import Image import torch from_pil to tensor. open('your_image. Prepare environment. pil_to_tensor (pic: Any) → Tensor [source] ¶ Convert a PIL Image to a tensor of the same type. Converts a torch. ToPILImage() 将上述定义的转换应用于输入的 torch 张量，将其转换为 PIL 图像。 img To save a tensor as an image in PyTorch, you can use the following steps: 1. Convert the tensor to a numpy array. ToTensor() # Convert the image to PyTorch tensor tensor = transform 変換方法の注意点は、PyTorchでのTensor、Numpy、PIL imageの相互変換において非常に重要です。TensorとNumpyの相互変換では、データ型や形状の互換性に注意する必要があります。たとえば、Tensorのデータ型がfloat32の場合、Numpy配列もfloat32である必要があります Jun 24, 2019 · Suppose our torch tensor follows the NCHW format. transform = T. clone image = image. Fortunately, this conversion process is pretty straightforward. Image mode) – color space and pixel depth of input data (optional). ndarray to torch tensor of data type torch. Image import numpy as np # 假设pil_img是一个PIL图像 pil_img = PIL. imshow(pil_image) plt from PIL import Image import torchvision img = Image. ndarray. Use the `PIL. PIL Image & Numpy Array Image. PILToTensor Convert a PIL Image to a tensor of the same type - this does not scale values. See PILToTensor for more details. Install the following packages using pip: pip install torch torchvision pip install To save a tensor as an image in PyTorch, you can use the following steps: 1. jpg') image = cv2. to_pil_image (pic, mode = None) [source] ¶ Convert a tensor or an ndarray to PIL Image. If omitted and data is a torch. array(pil_img) # 现在img是一个ndarray类型的图像 通过以上两种方法，我们可以将图像参数转换为正确的类型，进而解决TypeError: pic should be PIL Image Aug 16, 2017 · HI, I am reading an image using pil, then transforming it into a tensor and then back into PIL. transforms. save()` function to save the image to a file. 肯定是需要tensor的图像操作传入的是PIL，因此在合适的位置前将PIL转换为tensor即可. transforms as T from PIL import Image. functional. The result is different from the original image. Tensor, the device is taken from it pil_to_tensor¶ torchvision. Nov 6, 2021 · # Import the required libraries import torch import cv2 import torchvision. TypeError: tensor should be a torch tensor. jpg") torchvision. Tensor)是一个在调试中比较重要 import PIL. transform = transforms. v2. open("img. 2. 而且使用不同图像处理库读取出来的图片格式也不相同,因此,如何在pytorch中正确转化各种图片格式(PIL. Compose([transforms. This function does not support torchscript. pyplot as plt # loader使用torchvision中自带的transforms函数 loader = transforms. ToPILImage() module and then treating it as PIL Image as your second function would work. device (torch. Convert a tensor or an ndarray to PIL Image. from_numpy(np. COLOR_BGR2RGB) # Define a transform to convert the image to tensor transform = transforms. PIL图像转换为Tensor在Pytorch中，PIL图像可以通过以下方式转换为Tensor： import torch from PIL import Image image = Image. open("image. Here img is a numpy. jpg") img = np. This transform does not support torchscript. ToPILImage() Apply the above-defined transform on the input torch tensor to convert it to a PIL image. pyplot as plt import torch from torchvision import transforms img = Image. Got < class 'PIL. 1 tensor should be a torch tensor. dpython:type, optional) – Desired data type. ToTensor()]) As you can see in the documentation, torchvision. Height x Width x Depth (=Channel) Height : 높이 Pixel수; Width : 넓이 Pixel수; Depth : 이미지의 '장'수 느낌, RGB의 경우 3장, Gray-scale의 경우 0 또는 1 data (tensor-like, PIL. Parameters: mode (PIL. Read the input image. rand (1, 100, 100) # Example of a single-channel image tensor # Check if image_tensor is a grayscale image and has a single channel if image_tensor. 解决方法从. ndarray to tensor. jpg') # 画像をテンソルに変換 tensor_image = transforms. Jun 2, 2023 · When working with images, it's often useful to convert PyTorch tensors to PIL images for visualization and analysis purposes. ToPILImage() 将上述定义的转换应用于输入的 torch 张量，将其转换为 PIL 图像。 img Jun 16, 2024 · This transform converts any numpy. ToPILImage()(tensor_image) # Pillow画像をMatplotlibで表示 plt. Image’>. Compose ([transforms. squeeze (0) image Nov 11, 2024 · A. cvtColor(image, cv2. squeeze (0) # Remove the This happens because of the transformation you use: self. dtype (torch. 3. float32 in range 0 and 1. Image' >. Resize (255), transforms. array (img). mode (PIL. import torch import torchvision import torchvision. Define the transform to convert the image to Torch Tensor. ToPureTensor Convert all TVTensors to pure tensors, removing associated metadata (if any). 먼저 PIL Image 와 Numpy Array Image 는 아래와 같은 구조를 가지고 있다. save tensor into image directly In this situation, you can use; save_image(make_grid(postprocess_image(batch_tensor), nrow=8),"XXX. Here is an example of how to save a tensor as an image in PyTorch: python Sep 18, 2021 · PIL(Python Imaging Library)是Python中最基础的图像处理库，而使用PyTorch将原始输入图像预处理为神经网络的输入，经常需要用到三种格式PIL Image、Numpy和Tensor，其中预处理包括但不限于「图像裁剪」，「图像旋转」和「图像数据归一化」等。而对图像的多种处理在code中可以 import torch from torchvision import transforms import matplotlib. cpu (). device, optional) – Desired device. pil_to_tensor¶ torchvision. ndarray) – Image to be converted to PIL Image. torchvision. transforms as T from PIL import Image 定义一个形状为 [C, H, W] 的torch张量。 tensor = torch. Convert a tensor, ndarray, or PIL Image to Image; this does not scale values. Here is an example. Image) – Any data that can be turned into a tensor with torch. Parameters: pic (Tensor or numpy. transforms as transforms # Read the image image = cv2. import numpy as np import matplotlib. shape [0] == 1: # Check if single channel image_tensor = image_tensor. Approach: Import the required libraries. unsqueeze (0) return image. Image mode) – color space and pixel depth of input import torch import torchvision import torchvision. ToTensor converts a PIL Image or numpy. float) 3 Tensor转化为PIL图片 # 输入tensor变量 # 输出PIL格式图片 def tensor_to_PIL (tensor): image = tensor. array(image) Dec 5, 2018 · I've written a simple function to visualize the pytorch tensor using matplotlib. tensor = torch. fromarray()` function to create an image object from the numpy array. numpy. Aug 7, 2022 · Converting PyTorch Tensor to the PIL Image object using torchvision. pyplot as plt import torch def show(*imgs): ''' input imgs can be single or multiple tensor(s), this function uses matplotlib to visualize. ToPILImage ([mode]) Convert a tensor or an ndarray to PIL Image 2 将PIL图片转化为Tensor # 输入PIL格式图片 # 返回tensor变量 def PIL_to_tensor (image): image = loader (image). png') tensor_img = torch. rand(3,256,256) 定义一个转换来将torch张量转换为PIL图像。 transform = T. The input image is either PIL image or a NumPy N-dimensional array. save tensor into summayWriter In this case, you can use: Aug 27, 2020 · 主要运用ToTensor()方法转为tensor，并把灰度范围从0-255变换到0-1之间，还可以运用其它一系列方法，如：transform. Got <class ‘PIL. Aug 23, 2024 · import torch # Create a sample grayscale image tensor with shape (1, H, W) image_tensor = torch. as_tensor() as well as PIL images. *Tensor of shape C x H x W or a numpy ndarray of shape H x W x C to a PIL Image while adjusting the value range depending on the mode. 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