When I run img2pdf on a back of pictures downloaded from GoogleBooks, I get the issue "unsupported colorspace" for some of the PNGs inside the folder.
I changed the colorspace to 1 and it makes it work for text only pages but it fails on other pages... any idea how I could ensure it selects the right colorspace by itelf depending on the picture?
Imported comments:
By josch on 2013-10-20 18:05:33 UTC
Can you supply an example image?
By ekianjo on 2013-10-21 00:50:50 UTC
Sure. Will send it later tonight.
By ekianjo on 2013-10-21 14:07:49 UTC
Here it is
By josch on 2013-10-21 14:25:32 UTC
First of all, this *.png image is actually a jpeg image.
Second of all, I dont have any problems with converting above image into pdf.
The colorspace is selected automatically by PIL. Can you tell me which colorspace it selects for you by running it with the --verbose option? It correctly identifies it as RGB here.
By TonyStark on 2014-10-22 14:05:45 UTC
I also get problem unsupported color space: P and unsupported color space: RGBA Error
By josch on 2014-11-02 07:30:59 UTC
@TonyStark please provide more info by giving an example image and the output with the --verbose option
By DarwinAwardWinner on 2014-11-06 07:59:30 UTC
By the way, you can easily generate a test file by converting a PNG to indexed colorspace in GIMP (Image -> Mode -> Indexed) and saving it.
D: input dpi=96 x 96
D: input colorspace= RGBA
D: width x height=1597 x 2100
D: imgformat= PNG
E: unsupported color space: RGBA
By DarwinAwardWinner on 2014-11-10 09:11:21 UTC
Are you sure you're using a version of picopt from after #18 was merged?
By TonyStark on 2014-11-10 09:12:01 UTC
@DarwinAwardWinner
no, let me try with that version..
By TonyStark on 2014-11-10 09:18:28 UTC
@DarwinAwardWinner
Thanx....
I update img2pdf.py and now works --verbose give me this output
D: Reading test.png
D: input dpi=96 x 96
D: input colorspace= RGBA
D: width x height=1597 x 2100
D: imgformat= PNG
D: Converting colorspace RGBA to RGB
By josch on 2014-11-10 09:18:32 UTC
I released 0.1.3 which includes the fixes by @DarwinAwardWinner and some fix of mine. I'm able to convert the test input of @TonyStark with that version. Give it a try!
By josch on 2014-11-10 09:19:01 UTC
It's also on pypi if that matters.
By TonyStark on 2014-11-10 09:21:04 UTC
@josch
Now Working with RGBA to RGB and P to RGB
No any error... 👍
By DarwinAwardWinner on 2014-11-10 09:21:19 UTC
I will say, though, having to convert indexed color to RGB is a little unfortunate, since it increases the file size a good bit. (Compare to imagemagick's "convert" utility converting png to pdf.) I wish I knew PIL well enough to write a special-case for indexed color inputs.
By TonyStark on 2014-11-10 09:24:21 UTC
@DarwinAwardWinner
well ghostscript is best to compress pdf instead using imagemagick to compress png...
test.png --> img2pdf --> out.pdf [1.2mb] ---> Ghostscript ---> out2.pdf [184kb]
By DarwinAwardWinner on 2014-11-10 09:27:47 UTC
Huh. I'll have to try that.
By josch on 2014-11-10 09:31:31 UTC
@DarwinAwardWinner imagemagick is able to convert indexed pngs to pdf at reduced size compared to img2pdf because it is lossy. The purpose of img2pdf is to not be lossy
@TonyStark your ghostscript step is lossy, so no need to use img2pdf
The limitation here is the image formats that PDF can read. The choices are JPEG, JP2 and Flate. The first two are lossy jpeg encodings (which img2pdf makes lossless if the input is a jpeg as well) and the last is just a zipped raw RGB, Grayscale or Black/White stream. To my knowledge, there is no option for palletted images there. So an image with indexed input image can only be converted to RGB to work with PDF.
By TonyStark on 2014-11-10 09:40:45 UTC
@josch
ya its lossy output of ghostscript, but its good to readable
By josch on 2014-11-10 14:43:59 UTC
@TonyStark but if you want lossless in the first place, then what use is img2pdf for you?
*By josch on 2015-03-15T09:41:52.007Z*
*Created by: ekianjo*
When I run img2pdf on a back of pictures downloaded from GoogleBooks, I get the issue "unsupported colorspace" for some of the PNGs inside the folder.
I changed the colorspace to 1 and it makes it work for text only pages but it fails on other pages... any idea how I could ensure it selects the right colorspace by itelf depending on the picture?
**Imported comments:**
*By josch on 2013-10-20 18:05:33 UTC*
Can you supply an example image?
*By ekianjo on 2013-10-21 00:50:50 UTC*
Sure. Will send it later tonight.
*By ekianjo on 2013-10-21 14:07:49 UTC*
Here it is
*By josch on 2013-10-21 14:25:32 UTC*
First of all, this *.png image is actually a jpeg image.
Second of all, I dont have any problems with converting above image into pdf.
The colorspace is selected automatically by PIL. Can you tell me which colorspace it selects for you by running it with the --verbose option? It correctly identifies it as RGB here.
*By TonyStark on 2014-10-22 14:05:45 UTC*
I also get problem ```unsupported color space: P``` and ```unsupported color space: RGBA``` Error
*By josch on 2014-11-02 07:30:59 UTC*
@TonyStark please provide more info by giving an example image and the output with the --verbose option
*By DarwinAwardWinner on 2014-11-06 07:59:30 UTC*
By the way, you can easily generate a test file by converting a PNG to indexed colorspace in GIMP (Image -> Mode -> Indexed) and saving it.
*By TonyStark on 2014-11-10 09:06:50 UTC*
@josch ```--verbose``` give me below output
```bash
D: input dpi = 96 x 96
D: input colorspace = RGBA
D: width x height = 1597 x 2100
D: imgformat = PNG
E: unsupported color space: RGBA
```
*By DarwinAwardWinner on 2014-11-10 09:11:21 UTC*
Are you sure you're using a version of picopt from after #18 was merged?
*By TonyStark on 2014-11-10 09:12:01 UTC*
@DarwinAwardWinner
no, let me try with that version..
*By TonyStark on 2014-11-10 09:18:28 UTC*
@DarwinAwardWinner
Thanx....
I update ```img2pdf.py``` and now works
```--verbose``` give me this output
```bash
D: Reading test.png
D: input dpi = 96 x 96
D: input colorspace = RGBA
D: width x height = 1597 x 2100
D: imgformat = PNG
D: Converting colorspace RGBA to RGB
```
*By josch on 2014-11-10 09:18:32 UTC*
I released 0.1.3 which includes the fixes by @DarwinAwardWinner and some fix of mine. I'm able to convert the test input of @TonyStark with that version. Give it a try!
*By josch on 2014-11-10 09:19:01 UTC*
It's also on pypi if that matters.
*By TonyStark on 2014-11-10 09:21:04 UTC*
@josch
Now Working with RGBA to RGB and P to RGB
No any error... :+1:
*By DarwinAwardWinner on 2014-11-10 09:21:19 UTC*
I will say, though, having to convert indexed color to RGB is a little unfortunate, since it increases the file size a good bit. (Compare to imagemagick's "convert" utility converting png to pdf.) I wish I knew PIL well enough to write a special-case for indexed color inputs.
*By TonyStark on 2014-11-10 09:24:21 UTC*
@DarwinAwardWinner
well ghostscript is best to compress pdf instead using imagemagick to compress png...
test.png --> img2pdf --> out.pdf [1.2mb] ---> Ghostscript ---> out2.pdf [184kb]
*By DarwinAwardWinner on 2014-11-10 09:27:47 UTC*
Huh. I'll have to try that.
*By josch on 2014-11-10 09:31:31 UTC*
@DarwinAwardWinner imagemagick is able to convert indexed pngs to pdf at reduced size compared to img2pdf because it is lossy. The purpose of img2pdf is to not be lossy
@TonyStark your ghostscript step is lossy, so no need to use img2pdf
The limitation here is the image formats that PDF can read. The choices are JPEG, JP2 and Flate. The first two are lossy jpeg encodings (which img2pdf makes lossless if the input is a jpeg as well) and the last is just a zipped raw RGB, Grayscale or Black/White stream. To my knowledge, there is no option for palletted images there. So an image with indexed input image can only be converted to RGB to work with PDF.
*By TonyStark on 2014-11-10 09:40:45 UTC*
@josch
ya its lossy output of ghostscript, but its good to readable
*By josch on 2014-11-10 14:43:59 UTC*
@TonyStark but if you want lossless in the first place, then what use is img2pdf for you?
*By TonyStark on 2014-11-10 16:29:33 UTC*
@josch
im just giving example of size reducing..
*By josch on 2014-11-10 18:03:44 UTC*
This seems to be solved. Closing.
By josch on 2015-03-15T09:41:52.007Z
Created by: ekianjo
When I run img2pdf on a back of pictures downloaded from GoogleBooks, I get the issue "unsupported colorspace" for some of the PNGs inside the folder.
I changed the colorspace to 1 and it makes it work for text only pages but it fails on other pages... any idea how I could ensure it selects the right colorspace by itelf depending on the picture?
Imported comments:
By josch on 2013-10-20 18:05:33 UTC
Can you supply an example image?
By ekianjo on 2013-10-21 00:50:50 UTC
Sure. Will send it later tonight.
By ekianjo on 2013-10-21 14:07:49 UTC
Here it is
By josch on 2013-10-21 14:25:32 UTC
First of all, this *.png image is actually a jpeg image.
Second of all, I dont have any problems with converting above image into pdf.
The colorspace is selected automatically by PIL. Can you tell me which colorspace it selects for you by running it with the --verbose option? It correctly identifies it as RGB here.
By TonyStark on 2014-10-22 14:05:45 UTC
I also get problem
unsupported color space: Pandunsupported color space: RGBAErrorBy josch on 2014-11-02 07:30:59 UTC
@TonyStark please provide more info by giving an example image and the output with the --verbose option
By DarwinAwardWinner on 2014-11-06 07:59:30 UTC
By the way, you can easily generate a test file by converting a PNG to indexed colorspace in GIMP (Image -> Mode -> Indexed) and saving it.
By TonyStark on 2014-11-10 09:06:50 UTC
@josch
--verbosegive me below outputBy DarwinAwardWinner on 2014-11-10 09:11:21 UTC
Are you sure you're using a version of picopt from after #18 was merged?
By TonyStark on 2014-11-10 09:12:01 UTC
@DarwinAwardWinner
no, let me try with that version..
By TonyStark on 2014-11-10 09:18:28 UTC
@DarwinAwardWinner
Thanx....
I update
img2pdf.pyand now works--verbosegive me this outputBy josch on 2014-11-10 09:18:32 UTC
I released 0.1.3 which includes the fixes by @DarwinAwardWinner and some fix of mine. I'm able to convert the test input of @TonyStark with that version. Give it a try!
By josch on 2014-11-10 09:19:01 UTC
It's also on pypi if that matters.
By TonyStark on 2014-11-10 09:21:04 UTC
@josch
Now Working with RGBA to RGB and P to RGB
No any error... 👍
By DarwinAwardWinner on 2014-11-10 09:21:19 UTC
I will say, though, having to convert indexed color to RGB is a little unfortunate, since it increases the file size a good bit. (Compare to imagemagick's "convert" utility converting png to pdf.) I wish I knew PIL well enough to write a special-case for indexed color inputs.
By TonyStark on 2014-11-10 09:24:21 UTC
@DarwinAwardWinner
well ghostscript is best to compress pdf instead using imagemagick to compress png...
test.png --> img2pdf --> out.pdf [1.2mb] ---> Ghostscript ---> out2.pdf [184kb]
By DarwinAwardWinner on 2014-11-10 09:27:47 UTC
Huh. I'll have to try that.
By josch on 2014-11-10 09:31:31 UTC
@DarwinAwardWinner imagemagick is able to convert indexed pngs to pdf at reduced size compared to img2pdf because it is lossy. The purpose of img2pdf is to not be lossy
@TonyStark your ghostscript step is lossy, so no need to use img2pdf
The limitation here is the image formats that PDF can read. The choices are JPEG, JP2 and Flate. The first two are lossy jpeg encodings (which img2pdf makes lossless if the input is a jpeg as well) and the last is just a zipped raw RGB, Grayscale or Black/White stream. To my knowledge, there is no option for palletted images there. So an image with indexed input image can only be converted to RGB to work with PDF.
By TonyStark on 2014-11-10 09:40:45 UTC
@josch
ya its lossy output of ghostscript, but its good to readable
By josch on 2014-11-10 14:43:59 UTC
@TonyStark but if you want lossless in the first place, then what use is img2pdf for you?
By TonyStark on 2014-11-10 16:29:33 UTC
@josch
im just giving example of size reducing..
By josch on 2014-11-10 18:03:44 UTC
This seems to be solved. Closing.