Re: [gentoo-user] {OT} image metadata and privacy
Yes, I just had to do this myself. There are two packages: jhead and exiftool. The former does jpegs only. I wound up using exiftool, there's a single command to strip all metadata: exiftool -all= *.jpg If I remember right that creates a copy of the file it processes. You can use exiftool to list tags and also remove individual tags. I used it to make sure there were no GPS tags in pictures from my phone. I thought I had some problems getting exiftool to work with a PNG file but now I realize I didn't understand how to use it. I think that should be the de facto method for removing EXIF data from many different image formats. - Grant Has anyone found a way to completely sanitize images of all potentially privacy-invading metadata for posting online? I recently discovered that there is actually an EXIF thumbnail image. So if you have a photo and you crop it and post it online, the EXIF thumbnail of the original uncropped image is still there for all to see. - Grant
[gentoo-user] {OT} image metadata and privacy
Has anyone found a way to completely sanitize images of all potentially privacy-invading metadata for posting online? I recently discovered that there is actually an EXIF thumbnail image. So if you have a photo and you crop it and post it online, the EXIF thumbnail of the original uncropped image is still there for all to see. - Grant
Re: [gentoo-user] {OT} image metadata and privacy
On 09/05/2013 02:32 PM, Grant wrote: Has anyone found a way to completely sanitize images of all potentially privacy-invading metadata for posting online? I recently discovered that there is actually an EXIF thumbnail image. So if you have a photo and you crop it and post it online, the EXIF thumbnail of the original uncropped image is still there for all to see. - Grant http://stackoverflow.com/questions/13646028/how-to-remove-exif-from-a-jpg-without-losing-image-quality/17516878#17516878
Re: [gentoo-user] {OT} image metadata and privacy
Hi Grant, Yes, I just had to do this myself. There are two packages: jhead and exiftool. The former does jpegs only. I wound up using exiftool, there's a single command to strip all metadata: exiftool -all= *.jpg If I remember right that creates a copy of the file it processes. You can use exiftool to list tags and also remove individual tags. I used it to make sure there were no GPS tags in pictures from my phone. Dan On 09/05/2013 06:32 AM, Grant wrote: Has anyone found a way to completely sanitize images of all potentially privacy-invading metadata for posting online? I recently discovered that there is actually an EXIF thumbnail image. So if you have a photo and you crop it and post it online, the EXIF thumbnail of the original uncropped image is still there for all to see. - Grant
Re: [gentoo-user] {OT} image metadata and privacy
On Thu, Sep 5, 2013 at 8:32 AM, Grant emailgr...@gmail.com wrote: Has anyone found a way to completely sanitize images of all potentially privacy-invading metadata for posting online? I recently discovered that there is actually an EXIF thumbnail image. So if you have a photo and you crop it and post it online, the EXIF thumbnail of the original uncropped image is still there for all to see. Whether or not the thumbnail remains uncropped depends on the cropping software. Competent software should not do that to you, but as we know not all software has been created equal. You can use jpegoptim --strip-all to remove any and all extra data from your picture. Gentoo package name is media-gfx/jpegoptim.
