I want to convert a jpg image to tiff.
I tried to do it with opencv with python.
import cv2
image = cv2.imread("image.jpg")
retval, buf = cv2.imencode(".tiff", image)
cv2.imwrite("out.tiff")
And I have this:
Process finished with exit code 136 (interrupted by signal 8: SIGFPE)
I referred this link
But I couldn't make it work.
Any help would be appreciated.
For me this version worked without errors:
import cv2
image = cv2.imread("image.jpg")
cv2.imwrite("out.tiff", image)
Why do you need the imencode? Using that gives the same resulting file for me, just creates a temporary memory buffered, already TIFF-compressed version of the image:
retval, buf = cv2.imencode(".tiff", image)
with open('out2.tiff', 'wb') as fout:
fout.write(buf.tostring())
Related
from kivy.uix.image import Image
self.img = Image(source="image") # This works when image is an PNG image
self.img = Image(source="image.jpg") # This works when image.jpg is a JPG image
self.img = Image(source="image") # This doesn't work when image is a JPG image
I need to specify images without extention for the app to be generic (working with more image types). Can I achieve it somehow?
Kivy is using "imghdr" to determine the image type here, and as a fallback it uses the file extension here.
That explains why the image loads fine when it has a file extension, even though "imghdr" can't find the file type in the file's content.
I tested on a list of JPEG files, and each time "imghdr" was able to detect the file type each time. That is done here im imghdr. Notably, "imghdr" does not consider the file extension.
$ python
>>> import os, imghdr
... for f in os.listdir('.'):
... print('%s -- %s' % (f, imghdr.what(f)))
Maybe the JPEG file is missing the "JFIF" or "Exif" string that imghdr is looking for? You could use hexedit to see if one of those string is present at Byte 6 of the image file.
I use PythonMagick in my project. When i convert SVG to JPG in command line like "convert x.svg x.jpg" it's ok. When i use PythonMagick i get all black image. I'm confused cuz i have that error only at 2 of 4 computers. They all have approximately similar libraries and OS ubuntu 16-18. Maybe someone can give me some tips what i do wrong. Here is my code.
tmp = tempfile.NamedTemporaryFile(delete=False)
blob = PythonMagick.Blob()
img = PythonMagick.Image('x.svg')
img.composite(img, 0, 0, PythonMagick.CompositeOperator.SrcOverCompositeOp)
img.write(blob, 'jpg')
tmp.write(blob.data)
I am using this line of code to call my image in python
(img = cv2.imread("frame12160.jpg")
but I can just call one image once a time how can I call multiple images every time and thanks in advance
You can only read one image at a time using cv2.imread(). If you want to read in multiple images, try using the os package and save the images into a list:
import cv2
import os
my_images = []
os.chdir('/home/stephen/Desktop/images/')
for path in os.listdir(os.getcwd()):
img = cv2.imread(path)
my_images.append(img)
I encountered a problem when I want to read an image using the OpenCV function imread().
The image is Ok and I can show it in the image display software.
But when I use the imdecode() to get the image data, the data returns NULL.
I will upload the image and the code and hope some one could help me
Mat img = imread(image_name);
if(!img.data) return -1;
The image's link is here: http://img3.douban.com/view/photo/raw/public/p2198361185.jpg
PS: The image_name is all right.
I guess OpenCV cannot decode this image. So is there any way to decode this image using OpenCV?, like add new decode library. By the way, I can read this image using other image library such as freeImage.
Your image is in .gif and it is not supported by OpenCV as of now.
Note OpenCV offers support for the image formats Windows bitmap (bmp),
portable image formats (pbm, pgm, ppm) and Sun raster (sr, ras). With
help of plugins (you need to specify to use them if you build yourself
the library, nevertheless in the packages we ship present by default)
you may also load image formats like JPEG (jpeg, jpg, jpe), JPEG 2000
(jp2 - codenamed in the CMake as Jasper), TIFF files (tiff, tif) and
portable network graphics (png). Furthermore, OpenEXR is also a
possibility.
Source - Click here
You can use something like this, to perform the conversion.
I was able to load your image using imread using this. Also, you can check out FreeImage.
You can also try to use the library gif2numpy. It converts a gif image to a numpy image which then can be loaded by OpenCV:
import cv2, gif2numpy
np_images, extensions, image_specs = gif2numpy.convert("yourgifimage.gif")
cv2.imshow("np_image", np_images[0])
cv2.waitKey()
The library can be found here: https://github.com/bunkahle/gif2numpy It is not dependent on PIL or pillow for this like imageio.
There are two methods to read an image in OpenCV, one is using Mat the other one using IplImage. I see you have used the former one. You can try with the second argument of imread also:
image = imread("image.jpg", CV_LOAD_IMAGE_COLOR); // Read the file
else use IplImage
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc_c.h"
#include <opencv2/core/core.hpp>
IplImage* src = 0;
if( (src = cvLoadImage("filename.jpg",1)) == 0 )
{
printf("Cannot load file image %s\n", filename);
}
If they don't work please check if you have installed libjpeg, libtiff and other dependencies for reading an image in OpenCV.
Hope it would help.
I use puthon 2.7, windows 7 and opencv 2.4.6. and I try to run the following code:
https://github.com/kyatou/python-opencv_tutorial/blob/master/08_image_encode_decode.py
#import opencv library
import cv2
import sys
import numpy
argvs=sys.argv
if (len(argvs) != 2):
print 'Usage: # python %s imagefilename' % argvs[0]
quit()
imagefilename = argvs[1]
try:
img=cv2.imread(imagefilename, 1)
except:
print 'faild to load %s' % imagefilename
quit()
#encode to jpeg format
#encode param image quality 0 to 100. default:95
#if you want to shrink data size, choose low image quality.
encode_param=[int(cv2.IMWRITE_JPEG_QUALITY),90]
result,encimg=cv2.imencode('.jpg',img,encode_param)
if False==result:
print 'could not encode image!'
quit()
#decode from jpeg format
decimg=cv2.imdecode(encimg,1)
cv2.imshow('Source Image',img)
cv2.imshow('Decoded image',decimg)
cv2.waitKey(0)
cv2.destroyAllWindows()
I keep getting the following error:
encode_param=[int(cv2.IMWRITE_JPEG_QUALITY), 90]
AttributeError: 'module' object has no attribute 'IMWRITE_JPEG_QUALITY'
I have tried a lot of things: reinstall opencv, convert cv2 to cv code and searched different forums but I keep getting this error. Am I missing something? Is there someone who can run this code without getting the error?
BTW: Other opencv code (taking pictures from webcam) runs without problems....
At the moment I save the image to a temp JPG file. Using the imencode function I want to create the jpg file in the memory.
Thanks in advance and with best regards.
The problem is not in your code, it should work, but it is with your OpenCV Python package. I can't tell you why is raising that error, but you can avoid it by changing the line of the encode_param declaration by this one:
encode_param=[1, 90]