Affinity Designer Ipad v1 - Extracting Parts In A Specified Size From An Rasterized Image

[Mainecoon364]

I want to extract parts in a specified size from an rasterized image.

 

For example every shoe from this image. Sneakers

 

I want the size of the extracted images are consistent. Like 2 x 2 cm for every shoe image.

 

How do I do this?

[Dan C]

Hi @Mainecoon364,

Using Vector Masking is likely the best option here, as it allows you to ensure the 'cut' section is the same size for each image -

Though as shown in the above recording, you might need to use smaller sizes for certain sneakers to ensure that other sections of the image are not included.

I hope this helps

[Alfred]

2 hours ago, Dan C said:

Using Vector Masking is likely the best option here

Agreed, although I would recommend using rectangles that are only slightly opaque so that you can see the image underneath. This makes it much easier to adjust the sizes and positions to make sure you only get one whole shoe in each cell of the grid.

Instead of creating 55 small rectangles — one for each shoe — create one wide rectangle and one tall rectangle:

Duplicate the wide rectangle 10 times and the tall rectangle 4 times to make a total of 11 rows of wide rectangles and 5 columns of tall rectangles. Select all of the rectangles and use the Divide command on the Edit (‘…’) menu to create a grid of small rectangles from the overlapping large ones. Even with careful snapping, you’re very likely to end up with several tiny rectangles that you don’t need, but you can easily select and delete them via the Layers Studio.

You also need to duplicate the shoe layer so that you have a total of 55 copies. Once you’ve done that, drag one of the coloured rectangles and drop it onto the thumbnail of one of the shoe layers. This will crop/mask the image so that you only see one shoe, and the cropping rectangle will become invisible.

Repeat the cropping/masking steps to isolate each of the remaining shoe pictures.

[Mainecoon364]

How to export them as individual files for each shoe?

 

[walt.farrell]

20 minutes ago, Mainecoon364 said:

How to export them as individual files for each shoe?

 

The Export Persona should allow you to create Slices for the Rectangles, and export to individual files.

[Mainecoon364]

@Alfred Do I duplicate the base layer 55 times and drag the grids into them one by one for masking?

[Alfred]

14 hours ago, Mainecoon364 said:

@Alfred Do I duplicate the base layer 55 times and drag the grids into them one by one for masking?

There might be a quicker way, but that’s what I did. I couldn’t see an efficient way to do it with slices.

[Mainecoon364]

After creating Grids like you did (Creating column and row rectangles and apply edit - divide to them)

 

A lot of layers come up… (which are individual shoes)

 

I don’t understand how do we do It in quicker way after this step.

 

Could you tell It in detail this part please?

[Alfred]

As I said, I couldn’t see a quicker way. I ended up with the layers that you see in my last screenshot (Curve, Curve, Curve, … Background, Background, Background) and then I mask-nested each of the 55 curve layers to the corresponding picture layer to isolate that particular shoe.

[Mainecoon364]

Understood. Thank you very much all.