Re: OT grid help

[John]

On 1/12/2017 6:24 PM, David J Brooks wrote:

Hi all

I have decided to channel my inner David Savage and have started
taking weekly drawing classes. I have come at the end of the fall
classes but will start the winter in a fw weeks. The instructor
suggested i start off using what some of the other students are doing
and use the grid system, especially since i want  to work on my
perspective. I am using prints from some of my old building shots.

My problem is this. I have several pictures that printed out 4 3/4" x
7" and i want to draw it onto an 8x10 frame in my sketch book. I have
looked through google but most of the info shows how to double or half
the picture not how to do the odd sizes I;m horrible at this part of
mathematics, but, can someone suggest a google page or math page??so i
can work out the ratio

Dave



You don't need to do any complicated math to figure out what will fit.

4 3/4" x 7" is not the same ratio as 8" x 10", so the drawing will be a
cropped image. You just have to decide where to crop it.

Try marking out a 1/4 inch grid on a piece of clear acetate for an
overlay. That should give you 19 x 28 grid squares over your image.

Using a heavier marker or a different color, mark a frame of 16 grid
squares x 20 grid squares on your overlay.

That will show you what is inside the 8x10 "frame" if you double the
size by using a half inch grid in your drawing. It will also allow you
to decide where to best crop the image to fit your drawing frame.

If you use permanent pens for the 1/4 inch grids (or buy an already made
grid from an artist's supply shop), you can use alcohol (erasable) pens
for marking out different frames on it.

You can use a 3/4" grid in your drawing to triple the size or 1" grid to
quadruple it.

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Re: OT grid help

[Bob W-PDML]

They are not the same aspect ratio so if you scaled the picture up it would be 
distorted. You will have to leave a border, or crop the original if you don't 
want the distortion.

It's easier to think about it in mm. 121x178, which is a 6:9 ratio near as 
dammit, and 203x254. 

So I would either:

divide the smaller picture into a 6x9 grid, which is 35mm film ratio, and draw 
a 6x9 (inch) grid on the sketch book, 

or:

draw a 8:10 ratio frame ((121/10)*8=96mm x 120mm) on the smaller picture to 
crop it as required, with a 8:10 ratio grid inside it, and draw a 8x10 inch 
grid on the sketch book.

B

> On 12 Jan 2017, at 23:26, David J Brooks  wrote:
> 
> Hi all
> 
> I have decided to channel my inner David Savage and have started
> taking weekly drawing classes. I have come at the end of the fall
> classes but will start the winter in a fw weeks. The instructor
> suggested i start off using what some of the other students are doing
> and use the grid system, especially since i want  to work on my
> perspective. I am using prints from some of my old building shots.
> 
> My problem is this. I have several pictures that printed out 4 3/4" x
> 7" and i want to draw it onto an 8x10 frame in my sketch book. I have
> looked through google but most of the info shows how to double or half
> the picture not how to do the odd sizes I;m horrible at this part of
> mathematics, but, can someone suggest a google page or math page??so i
> can work out the ratio
> 
> Dave
> 
> -- 
> Documenting Life in Rural Ontario.
> www.caughtinmotion.com
> http://brooksinthecountry.blogspot.com/
> York Region, Ontario, Canada
> 
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> the directions.

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Re: OT grid help

[Larry Colen]

Take a photo, print it at 8x10, let the computer do the math

On January 12, 2017 3:24:17 PM PST, David J Brooks  wrote:
>Hi all
>
>I have decided to channel my inner David Savage and have started
>taking weekly drawing classes. I have come at the end of the fall
>classes but will start the winter in a fw weeks. The instructor
>suggested i start off using what some of the other students are doing
>and use the grid system, especially since i want  to work on my
>perspective. I am using prints from some of my old building shots.
>
>My problem is this. I have several pictures that printed out 4 3/4" x
>7" and i want to draw it onto an 8x10 frame in my sketch book. I have
>looked through google but most of the info shows how to double or half
>the picture not how to do the odd sizes I;m horrible at this part of
>mathematics, but, can someone suggest a google page or math page??so i
>can work out the ratio
>
>Dave

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OT grid help

[David J Brooks]

Hi all

I have decided to channel my inner David Savage and have started
taking weekly drawing classes. I have come at the end of the fall
classes but will start the winter in a fw weeks. The instructor
suggested i start off using what some of the other students are doing
and use the grid system, especially since i want  to work on my
perspective. I am using prints from some of my old building shots.

My problem is this. I have several pictures that printed out 4 3/4" x
7" and i want to draw it onto an 8x10 frame in my sketch book. I have
looked through google but most of the info shows how to double or half
the picture not how to do the odd sizes I;m horrible at this part of
mathematics, but, can someone suggest a google page or math page??so i
can work out the ratio

Dave

-- 
Documenting Life in Rural Ontario.
www.caughtinmotion.com
http://brooksinthecountry.blogspot.com/
York Region, Ontario, Canada

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