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EPUBCheck · Images, audio and media overlays

MED-003

Updated:

EPUBCheck MED-003 is an error message: “Picture "img" elements must reference core media type resources, but found resource "…" of type "…".” An img element points to an image in a format that is not a core media type.

The official message

Picture "img" elements must reference core media type resources, but found resource "%1$s" of type "%2$s".

Default severity
Error. The EPUB breaks a rule of the specification and is invalid. Stores and Send to Kindle may reject it, and EPUBCheck exits with status 1.
EPUBCheck version
5.4.0

%1$s, %2$s… are filled in with the file, value or element EPUBCheck found.

Typical causes

  • TIFF, BMP or other formats that reading apps are not required to display.

How to fix it

Terms used here

Other MED messages

  • MED-004 Image file header may be corrupted.
  • MED-009 The time specified in the clipBegin attribute must not be the same as clipEnd.

Message text and severity from EPUBCheck 5.4.0 (W3C, BSD-3-Clause). Explanation by EPUBLab.

FAQ

What does EPUBCheck MED-003 mean?

EPUBCheck MED-003 is an error message: “Picture "img" elements must reference core media type resources, but found resource "…" of type "…".” An img element points to an image in a format that is not a core media type.

Is MED-003 an error?

MED-003 is reported as error by default. The EPUB breaks a rule of the specification and is invalid. Stores and Send to Kindle may reject it, and EPUBCheck exits with status 1.