RE: Logotype images

["Bland, Graham" <Graham.Bland@xxxxxxxxxxxxxxx>]

B&W is not quite that simple, nor is colour.

For B&W how many greys are supported, 2 to 256 seems the likely range, also
for colour what colour palettes are supported.  There is also the issue of
screen resolution, if the size is to be standard expressed as 1" x 0.5" then
displays must scale the image depending on the pixels included, or if the
size is expressed in pixels then it will be very small on a high resolution
screen display and cover the whole screen on a WAP Phone.

As another consideration, what are the minimum display resolutions allowed,
I presume this would depend on the image, Can the image be displayed in 5
pixels by 3 pixels (an extreme case but what is the limit).

Should the image be a standard format such as a JPEG in which case scaling
becomes easier as long as the device supports the image type.


Graham Bland


> -----Original Message-----
> From: Stefan Santesson [mailto:stefan@xxxxxxxxxxxx]
> Sent: 13 August 2001 10:08
> To: ietf-pkix@xxxxxxx
> Subject: Logotype images
> 
> 
> 
> Since logotypes in certificates now is an approved PKIX work 
> item there are 
> some practical aspects to deal with.
> 
> 1) Logotype image size or scalable images.
> 
> We probably need to define a standard size for logotype 
> images or find 
> another way to define scalable logotypes in order to enhance 
> homogeneous 
> display of certificates.
> 
> The alternative is to allow scalable logotypes but I have 
> been told that 
> there are no easy and appropriate ways to do this.
> 
> 2) Colour and B&W images.
> 
> Some clients, such as mobile phones does not have colour 
> display and colour 
> images may not work in B&W.
> We probably need a convension that allows inclusion of 2 
> images for each 
> logotype (colour and B&W).
> Possible solotions are either a convension defined in the 
> ASN.1 structure 
> or just a file naming convension for the image files.
> 
> Any suggestions?
> 
> /Stefan 
> 

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