I would like to remove from my images their sRGB profile if they have one. the problem i don't know how to identify that an image have a sRGB profile. What the good way to do ?
In Imagemagick, use
convert image.suffix -format "%[profiles]\n" info:
or
convert image.suffix -format "%[profile:icc]\n" info:
unless your Imagemagick version is ancient.
For example:
convert logo.jpg -format "%[profiles]\n" info:
icc
convert logo.jpg -format "%[profile:icc]\n" info:
sRGB built-in
Please do not accept as the answer as Fred has already shown you the way, but here's how you can get the profile with PHP Imagick:
$img = new Imagick('image.jpg');
$img->setOption('format','%[profiles]');
$img->setImageFilename('info:');
$fd = fopen('php://memory','rwb');
$img->writeImageFile($fd);
fseek($fd, 0);
$info = fread($fd, 1024);
fclose($fd);
var_dump($info);
Sample Output
string(18) "app12,exif,icc,xmp"
Related
I installed imagemagick for Windows from official site. I am trying to generate a diff image from two PNG images using ImageMagick. I am using following command:
compare file2.png file1.png -compose Src "diff.png"
But command exits with EXIT code "1". When run with -verbose flag, below message gets printed.
Image:file2.png Channel distortion: Undefined
I searched google for possible reason, but haven't found any answer. There is official ImageMagick documentation on distortion, but that is too wide and technical (and I am a novice).
Any idea why this message is thrown by imagemagick utility?
There is no real error. That message comes up when you do not specify -metric XXX with compare and take the default. The exit code 1 is what ImageMagick produces on success, I believe. See if you have an output file called diff.png. If you add -metric rmse, for example, you should not get that message. If I run the following without -metric XXX, I get:
compare -verbose lena.png lena.jpg -compose src diff.png
lena.png PNG 256x256 256x256+0+0 8-bit sRGB 118327B 0.010u 0:00.004
lena.jpg JPEG 256x256 256x256+0+0 8-bit sRGB 31640B 0.000u 0:00.002
Image: lena.png
Channel distortion: Undefined
lena.png=>diff.png PNG 256x256 256x256+0+0 8-bit sRGB 3c 1322B 0.130u 0:00.039
So it works fine. The message is telling you that it does not know which metric to use to give you difference statistics. I am not sure what it uses to generate the output. The term distortion may be a poor choice and perhaps should have been difference statistics.
If I add -metric rmse, then I get:
compare -verbose -metric rmse lena.png lena.jpg -compose src diff.png
lena.png PNG 256x256 256x256+0+0 8-bit sRGB 118327B 0.010u 0:00.004
lena.jpg JPEG 256x256 256x256+0+0 8-bit sRGB 31640B 0.000u 0:00.001
Image: lena.png
Channel distortion: RMSE
red: 810.821 (0.0123723)
green: 658.701 (0.0100511)
blue: 945.653 (0.0144297)
all: 813.547 (0.0124139)
Similar or same resulting image, but now the compare scores are reported since a specific metric is specified.
See the section about comparison statistics here
I am trying to read and write jpegs wth Adobe RGB colorspace in OpenCV. OpenCV assumes the jpeg has sRGB colorspace and when displaying or writing to file, the image loses some of its color intensity. I found this intensity loss was due to colorspace difference by answers given to my previous question.
Is there anyway I can make OpenCV to read Adobe RGB colorspace without casting it to sRGB?
Some information that is hopefully useful for anyone looking for a work-around for dealing with ICC and other profiles...
You can see what profiles are present in an image using ImageMagick which is installed on most Linux distros and is available for macOS and Windows. In the Terminal, or Command Prompt on Windows, run:
magick identify -verbose frog.jpg | grep 'Profile-.*bytes'
Profile-icc: 578 bytes
That tells you this image has a 578 byte ICC profile embedded.
If you are on Windows and don't have grep, you can equally use the following, though you may need to double up the percent sign, or prefix it with a caret (^) or somehow escape it:
magick identify -format "%[profiles]" frog.jpg
icc
You can extract that profile from the image, using this command:
magick frog.jpg frog.icc
And, you'll get a 578 byte ICC profile:
ls -l *icc
-rw-r--r-- 1 mark staff 578 24 Apr 10:36 frog.icc
You can check that the profile looks correct using the file command:
file *icc
frog.icc: ColorSync color profile 2.1, type ADBE, RGB/XYZ-mntr device by ADBE, 560 bytes, 11-8-2000 19:51:59 "Adobe RGB (1998)"
You can apply that profile to some other file like this:
magick other.jpg -profile "icc:frog.icc" otherWithProfile.jpg
Once you have extracted the profile using the above method, you can apply it to an image that you plan to use with OpenCV using PIL/Pillow's ImageCMS Module.
For that, I think you need to use these steps or something very similar, though I have not tested it:
from PIL import Image, ImageCMS
import numpy as np
# Open frog with PIL/Pillow
im = Image.open('frog.jpg')
iccp = PIL.ImageCms.getOpenProfile("profile.icc")
rgbp = ImageCms.createProfile("sRGB")
icc2rgb = ImageCms.buildTransformFromOpenProfiles(rgbp, iccp, "RGB", "RGB")
result = ImageCms.applyTransform(im, icc2rgb)
You should then be able to convert the resulting image to a Numpy array that OpenCV can work with using:
OpenCVim = np.array(result)
and remember to then convert from RGB ordering to BGR with cv2.cvtColor().
Rather than detect and extract the ICC profile with ImageMagick, you could equally use PIL/Pillow like this:
from PIL import Image
im = Image.open('frog.jpg')
# Now look at "im.info"
{'jfif': 257,
'jfif_version': (1, 1),
'dpi': (72, 72),
'jfif_unit': 1,
'jfif_density': (72, 72),
'icc_profile': b'\x00\x00\x020ADBE\x02\x10\x00\x00mntrRGB XYZ \x07\xd0\x00\x08\x00\x0b\x00\x13\x003\x00;acspAPPL\x00\x00\x00\x00none\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xf6\xd6\x00\x01\x00\x00\x00\x00\xd3-ADBE\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\ncprt\x00\x00\x00\xfc\x00\x00\x002desc\x00\x00\x010\x00\x00\x00kwtpt\x00\x00\x01\x9c\x00\x00\x00\x14bkpt\x00\x00\x01\xb0\x00\x00\x00\x14rTRC\x00\x00\x01\xc4\x00\x00\x00\x0egTRC\x00\x00\x01\xd4\x00\x00\x00\x0ebTRC\x00\x00\x01\xe4\x00\x00\x00\x0erXYZ\x00\x00\x01\xf4\x00\x00\x00\x14gXYZ\x00\x00\x02\x08\x00\x00\x00\x14bXYZ\x00\x00\x02\x1c\x00\x00\x00\x14text\x00\x00\x00\x00Copyright 2000 Adobe Systems Incorporated\x00\x00\x00desc\x00\x00\x00\x00\x00\x00\x00\x11Adobe RGB (1998)\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00XYZ \x00\x00\x00\x00\x00\x00\xf3Q\x00\x01\x00\x00\x00\x01\x16\xccXYZ \x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00curv\x00\x00\x00\x00\x00\x00\x00\x01\x023\x00\x00curv\x00\x00\x00\x00\x00\x00\x00\x01\x023\x00\x00curv\x00\x00\x00\x00\x00\x00\x00\x01\x023\x00\x00XYZ \x00\x00\x00\x00\x00\x00\x9c\x18\x00\x00O\xa5\x00\x00\x04\xfcXYZ \x00\x00\x00\x00\x00\x004\x8d\x00\x00\xa0,\x00\x00\x0f\x95XYZ \x00\x00\x00\x00\x00\x00&1\x00\x00\x10/\x00\x00\xbe\x9c\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'}
Here's the frog.jpg image:
Keywords: Python, ImageMagick, image, image processing, profile, ICC profile, extract, insert, apply, transform, PIL, Pillow, OpenCV, CMS, pyCMS.
How can I determine the bit depth of a bmp file on Mac OS X? In particular, I want to check if a bmp file is a true 24 bit file, or if it is being saved as a greyscale (i.e. 8 bit) image. I have a black-and-white image which I think I have forced to be 24 bit (using convert -type TrueColor), but Imagemagick gives conflicting results:
> identify -verbose hiBW24.bmp
...
Type: Grayscale
Base type: Grayscale
Endianess: Undefined
Colorspace: Gray
> identify -debug coder hiBW24.bmp
...
Bits per pixel: 24
A number of other command-line utilities are no help, it seems:
> file hi.bmp
hi.bmp: data
> exiv2 hiBW24.bmp
File name : hiBW24.bmp
File size : 286338 Bytes
MIME type : image/x-ms-bmp
Image size : 200 x 477
hiBW24.bmp: No Exif data found in the file
> mediainfo -f hi.bmp
...[nothing useful]
If you want a commend-line utility try sips (do not forget to read the manpage with man sips). Example:
*terminal input*
sips -g all /Users/hg/Pictures/2012/03/14/QRCodeA.bmp
*output is:*
/Users/hg/Pictures/2012/03/14/QRCodeA.bmp
pixelWidth: 150
pixelHeight: 143
typeIdentifier: com.microsoft.bmp
format: bmp
formatOptions: default
dpiWidth: 96.000
dpiHeight: 96.000
samplesPerPixel: 3
bitsPerSample: 8
hasAlpha: no
space: RGB
I think the result contains the values you are after.
Another way is to open the image with the previewer preview.app and the open the info panel.
One of the most informative programs (but not easy to use) is exiftool by Phil Harvey http://www.sno.phy.queensu.ca/~phil/exiftool/ , which also works very well on MacOSX for a lot of file formats but maybe an overkill for your purpose.
I did this to investigate:
# create a black-to-white gradient and save as a BMP, then `identify` it to a file `unlim`
convert -size 256x256 gradient:black-white a.bmp
identify -verbose a.bmp > unlim
# create another black-to-white gradient but force 256 colours, then `identify` to a second file `256`
convert -size 256x256 gradient:black-white -colors 256 a.bmp
identify -verbose a.bmp > 256
# Now look at difference
opendiff unlim 256
And the difference is that the -colors 256 image has a palette in the header and has a Class:PseudoClass whereas the other has Class:Direct
I have an image and it's a jpg.
I tried running through jpegtran with the following command:
$ jpegtran -copy none -optimize image.jpg > out.jpg
The file outputs, but the image seems un-modified (no size change)
I tried jpegoptim:
$ jpegoptim image.jpg
image.jpg 4475x2984 24bit P JFIF [OK] 1679488 --> 1679488 bytes (0.00%), skipped.
I get the same results when I use --force with jpegoptim except it reports that it's optimized but there is no change in file size
Here is the image in question: http://i.imgur.com/NAuigj0.jpg
But I can't seem to get it to work with any other jpegs I have either (only tried a couple though).
Am I doing something wrong?
I downloaded your image from imgur, but the size is 189,056 bytes. Is it possible that imgur did something to your image?
Anyway, I managed to optimize it to 165,920 bytes using Leanify (I'm the author) and it's lossless.
I don't have possibility to run convert via cmdline and the only way to use Imagick is via the PHP5 wrapper. I would need to run following command:
convert in.jpg -channel RGB -auto-level +level-colors red,white out.jpg
Unfortunately I haven't found in documentation any method that would perform any of these options. Can somebody with better knowledge of the php wrapper help?
I found only Imagick::levelImage() but couldn't simulate -auto-level and level-colors is nowhere to be found.
Thanks for help
In the end I got help on imagemagick forum, so for anybody with similar problem, here is what worked for me.
$img = new Imagick('in.jpg');
// grayscale image
$img->modulateImage(100, 0, 100);
// instead of auto-level option, where 65535 = Imagick::getQuantumRange()
$img->contrastStretchImage (0, 65535, Imagick::CHANNEL_ALL);
// instead of missing level-colors option, apply clut with the 2 desired colors
$clut = new Imagick();
$clut->newPseudoImage(1, 2, "gradient:red-white");
$img->clutImage($clut);
$img->writeImage('out.jpg');
For more info you can read the imagemagick thread