问题
I'm trying to import a bunch of images of .jpeg file format. However I'm getting the error
Not a JPEG file: starts with 0x0a 0x4c
Now, I know 0x89 0x50 is how .png files start. But I can't understand what 0x0a 0x4c represents.
I also ran the file image001.jpeg command on the terminal and it gave me
JPEG image data, JFIF standard 1.01.
Also, when I'm importing these group of images, this error is thrown for different files each time, not the same ones. So, I guess it isn't an issue of the file being corrupted.
If it helps, the image files were generated and saved on the hard disk through the imwrite() function of opencv.
Thanks
Using ImageMagick, the following verbose output is obtained.
Image: /Users/deathstroke/Desktop/lipRead/VidTIMIT/mwbt0/video/sx383/roi081.jpeg
Format: JPEG (Joint Photographic Experts Group JFIF format)
Mime type: image/jpeg
Class: DirectClass
Geometry: 68x39+0+0
Units: Undefined
Type: TrueColor
Endianess: Undefined
Colorspace: sRGB
Depth: 8-bit
Channel depth:
red: 8-bit
green: 8-bit
blue: 8-bit
Channel statistics:
Pixels: 2652
Red:
min: 0 (0)
max: 223 (0.87451)
mean: 139.207 (0.54591)
standard deviation: 44.1822 (0.173263)
kurtosis: 0.798663
skewness: -1.01178
entropy: 0.942718
Green:
min: 0 (0)
max: 159 (0.623529)
mean: 87.1161 (0.341632)
standard deviation: 33.4156 (0.131041)
kurtosis: -0.162594
skewness: -0.485596
entropy: 0.955489
Blue:
min: 0 (0)
max: 249 (0.976471)
mean: 73.9367 (0.289948)
standard deviation: 43.7079 (0.171403)
kurtosis: 2.38585
skewness: 1.43844
entropy: 0.917047
Image statistics:
Overall:
min: 0 (0)
max: 249 (0.976471)
mean: 100.087 (0.392496)
standard deviation: 40.7392 (0.159761)
kurtosis: 2.09684
skewness: 0.445232
entropy: 0.938418
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)
Background color: white
Border color: srgb(223,223,223)
Matte color: grey74
Transparent color: black
Interlace: None
Intensity: Undefined
Compose: Over
Page geometry: 68x39+0+0
Dispose: Undefined
Iterations: 0
Compression: JPEG
Quality: 95
Orientation: Undefined
Properties:
date:create: 2016-04-15T23:19:32+06:00
date:modify: 2016-04-15T23:19:32+06:00
jpeg:colorspace: 2
jpeg:sampling-factor: 2x2,1x1,1x1
signature: d3f2c14b57043efd4edbf719dfe769aded504df16c5b9fc8ee436d7551993221
Artifacts:
filename: /Users/deathstroke/Desktop/lipRead/VidTIMIT/mwbt0/video/sx383/roi081.jpeg
verbose: true
Tainted: False
Filesize: 1.81KB
Number pixels: 2.65K
Pixels per second: 265KB
User time: 0.000u
Elapsed time: 0:01.009
Version: ImageMagick 6.9.3-7 Q16 x86_64 2016-03-27 http://www.imagemagick.org
回答1:
A JPEG Stream starts with an SOI marker FF D8. A JFIF file follows that with an APP0 marker FF E0.
It is entirely possible that you have a valid JPEG stream embedded somewhere in your data and that some applications are skipping over the non-jpeg data until they reach the SOI marker while other are puking on extraneous data.
回答2:
Is there an ImageMagick equivalent of OSX too?
What does this question mean? Imagemagick does not provide any OS. But there are a Imagemagick versions that do work on Mac OSX. Imagemagick provides one binary version for El Capitan ONLY. See http://www.imagemagick.org/script/binary-releases.php#macosx
But you can install from source or better install IM 6 or 7 from Homebrew or IM 7 from Mac Ports. The way I go about it, is to install all my delegates from MacPorts and install Imagemagick from source. See http://www.imagemagick.org/discourse-server/viewtopic.php?f=2&t=31844 and http://www.imagemagick.org/script/install-source.php#unix
来源：https://stackoverflow.com/questions/37014055/not-a-jpeg-file-starts-with-0x0a-0x4c-error