About image display in viewer

roger64 · 08-05-2017, 06:44 AM

Hi

It happens I may have to tune some image display. The easiest and quickest way -for me- is to use an inline style written within the img tag because it has the highest priority and so I do not have to fiddle with the css stylesheet. I just insert:

Code:

style="width:xx%;"

One example can be one image 400px wide that I wish to display with a 100% width.

This is sufficient with, say Koreader or Prince PDF to obtain the required display. However, I remarked that the Calibre viewer requires an additional height information, if not the image can be distorted. I managed to get a good result, adding the height:auto parameter.

Code:

style="width:xx%;height:auto;"

As this height:auto parameter is usually not required for other reading software, would it be possible for the viewer, if it's missing, to use it as a default ?

kovidgoyal · 08-05-2017, 06:48 AM

Why are you adding width:% in the first place? As far as I know all decent viewer programs automatically constrain images to be within the visible area. And making small images artificially larger jsut makes them pixelated. The calibre viewer has an option to control image fitting in the viewer preferences.

roger64 · 08-05-2017, 07:03 AM

Quote:

Originally Posted by kovidgoyal

Why are you adding width:% in the first place? As far as I know all decent viewer programs automatically constrain images to be within the visible area. And making small images artificially larger jsut makes them pixelated. The calibre viewer has an option to control image fitting in the viewer preferences.

Thank you

Using an inline style is is the ultima ratio because, unhappily, not all decent programs behave decently, particularly when the image values in CSS are not written in a fool proof way.. Some times image display goes over board ...

I will look in the viewer preferences if I can set up this option.

08-05-2017, 06:44 AM	#1
roger64 Wizard Posts: 2,622 Karma: 3000161 Join Date: Jan 2009 Device: Kindle PW3 (wifi)	About image display in viewer Hi It happens I may have to tune some image display. The easiest and quickest way -for me- is to use an inline style written within the img tag because it has the highest priority and so I do not have to fiddle with the css stylesheet. I just insert: Code: style="width:xx%;" One example can be one image 400px wide that I wish to display with a 100% width. This is sufficient with, say Koreader or Prince PDF to obtain the required display. However, I remarked that the Calibre viewer requires an additional height information, if not the image can be distorted. I managed to get a good result, adding the height:auto parameter. Code: style="width:xx%;height:auto;" As this height:auto parameter is usually not required for other reading software, would it be possible for the viewer, if it's missing, to use it as a default ? Last edited by roger64; 08-05-2017 at 06:48 AM.

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08-05-2017, 06:48 AM	#2
kovidgoyal creator of calibre Posts: 45,129 Karma: 27110892 Join Date: Oct 2006 Location: Mumbai, India Device: Various	Why are you adding width:% in the first place? As far as I know all decent viewer programs automatically constrain images to be within the visible area. And making small images artificially larger jsut makes them pixelated. The calibre viewer has an option to control image fitting in the viewer preferences.

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