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Provide recommendations for image formats to use in click-on-image problems.

    1: \label{Authoring_ImageResponse}
    2: 
    3: \textbf{imageresponse} implements a image-click answer. \textbf{imageresponse}
    4: tags should contain a \textbf{foilgroup} tag, which contain \textbf{foil}
    5: tags. Each \textbf{foil} tag can contain:
    6: 
    7: \begin{itemize}
    8: \item \textbf{image}\index{image}: required. The delimited text should
    9: correspond to a published image resource. Example: \texttt{<image>/res/adm/includes/templates/man1.jpg</image>}.
   10: The following image formats are recommended - gif, jpg or png.  Other formats may work, but there may be printing or display issues.
   11: The image should only appear once per foil.
   12: \item \textbf{rectangle}\index{rectangle}: required. The delimited text
   13: specifies a rectangular area that is correct, specified as \texttt{(x1,y1)-(x2,y2)},
   14: where x1, x2, y1, and y2 are number corresponding to the x and y coordinates
   15: of two corners that define a rectangle which specifies where the right
   16: answer for this foil is located on the image. For example, \texttt{(0,0)-(100,200)}
   17: will specify that a rectangle 100 pixels wide and 200 pixels tall,
   18: situated in the upper left of the image, is correct. At least one
   19: rectangle is required; multiple rectangles may be specified.
   20: \item \textbf{text}\index{text}: required. The delimited text is printed
   21: before the image is shown on the screen. This text is typically used
   22: to describe to the student what they are expected to click on.
   23: \end{itemize}

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