在JPG图像上操作时获取“不能将模式P写为JPEG”
在JPG图像上操作时获取“不能将模式P写为JPEG”
提问于 2014-02-10 05:22:52
我试图调整一些图像的大小，其中大部分是JPG。但在一些图片中，我得到了一个错误：
Traceback (most recent call last):
File "image_operation_new.py", line 168, in modifyImage
tempImage.save(finalName);
File "/Users/kshitiz/.virtualenvs/django_project/lib/python2.7/site- packages/PIL/Image.py", line 1465, in save
save_handler(self, fp, filename)
File "/Users/kshitiz/.virtualenvs/django_project/lib/python2.7/site- packages/PIL/JpegImagePlugin.py", line 455, in _save
raise IOError("cannot write mode %s as JPEG" % im.mode)
IOError: cannot write mode P as JPEG我没有改变形象类型，我使用的是枕头库。我的操作系统是Mac。我如何解决这个问题？
回答 5
Stack Overflow用户
回答已采纳
发布于 2014-02-10 05:37:35
您需要将图像转换为RGB模式。
Image.open('old.jpeg').convert('RGB').save('new.jpeg')Stack Overflow用户
发布于 2019-12-25 09:24:11
但是，这个答案已经很老了，但是，我认为在进行转换之前，通过检查模式，我会找到一种更好的方法来做到这一点：
if img.mode != 'RGB':
img = img.convert('RGB')这是保存JPEG格式的图像所必需的。
Stack Overflow用户
发布于 2020-12-08 01:43:43
- 背景
JPG不支持alpha = transparencyRGBA，P有alpha = transparencyRGBA=Red Green Blue Alpha
- 结果
cannot write mode RGBA as JPEGcannot write mode P as JPEG
- 溶液
- 在保存到JPG之前，丢弃
alpha = transparency- 例如:将
Image转换为RGB
- 例如:将
- 在保存到JPG之前，丢弃
- then save to `JPG`- 你的代码
if im.mode == "JPEG":
im.save("xxx.jpg")
# in most case, resulting jpg file is resized small one
elif rgba_or_p_im.mode in ["RGBA", "P"]:
rgb_im = rgba_or_p_im.convert("RGB")
rgb_im.save("xxx.jpg")
# some minor case, resulting jpg file is larger one, should meet your expectation- 为你做更多：
关于调整imgae文件的大小，我实现了一个函数，供您参考：
from PIL import Image, ImageDraw
cfgDefaultImageResample = Image.BICUBIC # Image.LANCZOS
def resizeImage(inputImage,
newSize,
resample=cfgDefaultImageResample,
outputFormat=None,
outputImageFile=None
):
"""
resize input image
resize normally means become smaller, reduce size
:param inputImage: image file object(fp) / filename / binary bytes
:param newSize: (width, height)
:param resample: PIL.Image.NEAREST, PIL.Image.BILINEAR, PIL.Image.BICUBIC, or PIL.Image.LANCZOS
https://pillow.readthedocs.io/en/stable/reference/Image.html#PIL.Image.Image.thumbnail
:param outputFormat: PNG/JPEG/BMP/GIF/TIFF/WebP/..., more refer:
https://pillow.readthedocs.io/en/stable/handbook/image-file-formats.html
if input image is filename with suffix, can omit this -> will infer from filename suffix
:param outputImageFile: output image file filename
:return:
input image file filename: output resized image to outputImageFile
input image binary bytes: resized image binary bytes
"""
openableImage = None
if isinstance(inputImage, str):
openableImage = inputImage
elif CommonUtils.isFileObject(inputImage):
openableImage = inputImage
elif isinstance(inputImage, bytes):
inputImageLen = len(inputImage)
openableImage = io.BytesIO(inputImage)
if openableImage:
imageFile = Image.open(openableImage)
elif isinstance(inputImage, Image.Image):
imageFile = inputImage
# <PIL.PngImagePlugin.PngImageFile image mode=RGBA size=3543x3543 at 0x1065F7A20>
imageFile.thumbnail(newSize, resample)
if outputImageFile:
# save to file
imageFile.save(outputImageFile)
imageFile.close()
else:
# save and return binary byte
imageOutput = io.BytesIO()
# imageFile.save(imageOutput)
outputImageFormat = None
if outputFormat:
outputImageFormat = outputFormat
elif imageFile.format:
outputImageFormat = imageFile.format
imageFile.save(imageOutput, outputImageFormat)
imageFile.close()
compressedImageBytes = imageOutput.getvalue()
compressedImageLen = len(compressedImageBytes)
compressRatio = float(compressedImageLen)/float(inputImageLen)
print("%s -> %s, resize ratio: %d%%" % (inputImageLen, compressedImageLen, int(compressRatio * 100)))
return compressedImageBytes在这里可以找到最新的代码：
https://github.com/crifan/crifanLibPython/blob/master/python3/crifanLib/thirdParty/crifanPillow.py
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/21669657
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