Converting 7mm to 4mm prints via % in paint

Have any questions or tips and advice on how to build those bits that don't come ready made.
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End2end
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Converting 7mm to 4mm prints via % in paint

Postby End2end » Tue Feb 23, 2021 10:44 pm

I've found seating cover sheets in 7mm (O) and need to convert them to 4mm (OO).
Using the KISS principle could someone let me know what % I would need to shrink them by using windows paint for 4mm (OO) seats please?
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Bufferstop
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Re: Converting 7mm to 4mm prints via % in paint

Postby Bufferstop » Tue Feb 23, 2021 11:16 pm

Divide by 7, multiply by 4 then by 100 for percent. seems to come out at 57.14% which sounds about right to me.
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Re: Converting 7mm to 4mm prints via % in paint

Postby End2end » Tue Feb 23, 2021 11:28 pm

57.14% That's excellent.
Thanks Bufferstop. ;)
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Re: Converting 7mm to 4mm prints via % in paint

Postby End2end » Tue Feb 23, 2021 11:30 pm

Just a quick check and paint does not allow decimals so 57% will have to do. ;)
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Ironduke
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Re: Converting 7mm to 4mm prints via % in paint

Postby Ironduke » Wed Feb 24, 2021 2:55 am

Hi End2end

End2end wrote:I've found seating cover sheets in 7mm (O) and need to convert them to 4mm (OO).


These are something you want to print onto paper or what?

for printing you will get better results using something like GIMP

With this, rather than reducing the picture size you can reduce the printing size but still retain the same number of pixels.

This results in a much higher quality print.

e.g.
Original size 300px x 100px
grumpy-pies.jpg
the original (300px)
grumpy-pies.jpg (14.89 KiB) Viewed 477 times


reduced to 79px using irfanview. When printed this came out very fuzzy.
grumpy-pies-2cm.jpg
reduced to 2cm (79px)
grumpy-pies-2cm.jpg (3.27 KiB) Viewed 477 times


Print size changed to 2cm but keeping 300px. Reducing the print size increases the pixels per mm when printed.
Image
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End2end
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Re: Converting 7mm to 4mm prints via % in paint

Postby End2end » Wed Feb 24, 2021 9:41 am

Thanks Ironduke. I'll check that out. :)
Luckily, yesterdays idea will be for internal seating. Mrs End2end already has the 57% version and will print them today so I can see the results. If they are not very good I'll give the resizing another go.
Thanks
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