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diff --git a/html/faq.html b/html/faq.html index d084d52a..bf03d1f1 100644 --- a/html/faq.html +++ b/html/faq.html @@ -47,6 +47,7 @@ ol.index { margin: 0; padding: 0 0 0 2em } <li><a href="#Q29">ARGFILE options</a></li> <li><a href="#Q30">Extracting all metadata</a></li> <li><a href="#Q31">Rewriting the entire file</a></li> +<li><a href="#Q32">Safely removing all metadata</a></li> </ol> </div> @@ -1783,8 +1784,29 @@ not seekable, so in-place editing is not possible with these files and again, like 1, two completely different algorithms would be required.</li> </ol></blockquote> +<a name="Q32"></a> +<p>32. <b>"How do I safely delete all metadata from a file?"</b></p> + +<blockquote>First of all, all metadata shouldn't be removed from some file types +(such as RAW images) because this information is necessary for display of the +image. JPEG is the most popular image format and most suited to erasing all +metadata because the image and metadata are well separated in this format. +However, even with JPEG images care should be taken because the metadata +may contain color space information which should be maintained to preserve the +color rendition.</blockquote> + +<blockquote>Here is a command that may be used to safely delete all metadata +from .JPG images in a directory: + +<pre>exiftool -ext jpg -all= --icc_profile:all -tagsfromfile @ -colorspacetags DIR</pre> + +This command deletes all metadata except the ICC Profile if it exists, then +copies back any EXIF color space tags (adding any mandatory EXIF tags using +default values if necessary). +</blockquote> + <hr> -<i>Last revised Feb 8, 2023</i> +<i>Last revised Mar 27, 2023</i> <p class='lf'><a href="index.html"><-- Back to ExifTool home page</a></p> </body> </html> |