Check-in [bd622aab21]

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</tr></thead><tbody>

<tr class='project projectdraft projectdraft87 project87'>
<td valign='top'><a href='./tip/529.md'>529</a></td>
<td valign='top'>Project</td>
<td valign='top'>8.7</td>
<td valign='top'>Draft</td>
<td valign='top'># TIP 529: Add metadata dict property to tk photo image</td>
<td></td>
</tr>
<tr class='project projectdraft projectdraft87 project87'>
<td valign='top'><a href='./tip/528.md'>528</a></td>
<td valign='top'>Project</td>
<td valign='top'>8.7</td>
<td valign='top'>Draft</td>

# TIP 529: Add metadata dict property to tk photo image
	Author:         Harald Oehlmann <[email protected]>
	State:          Draft
	Type:           Project
	Vote:           Pending
	Created:        07-Dec-2018
	Keywords:       Tk, image
	Tcl-Version:    8.7

The following commands are directly concerned:

    image create photo myimage -metadata $metadict
    myimage cget -metadata
    myimage configure -metadata $metadict

It is also ok to store application data related to the image within the property dict. A widget may store special properties.

Any load and save command may use the content of the metadata dict.
This may be an ongoing process, specially within the Img patch.

The commands are:

    image create photo myimage -file myfile.bmp
    myimage configure -file myfile.bmp
    myimage write file.bmp

The image create and file load functions recreate the metadata dict.
Any current contents is lost.

The write file commands uses any dict keys it knows.
Any unknown dict keys are ignored.

# Implementation

The current implementation is only a sketch in my brain.
I hope, that an image handler can set the options after reading and a binary extension of the image handlers is not necessary.
Nevertheless, I don't know jet.