Scaling ratio in Android images?

Question

I am developing a simple informative system which will use a lot of images. The problem is I do not know how to scale them to the folder of ldpi, mdpi, hdpi, and hdpi.

I read that android uses a scaling ratio like 3:4:6:8. Can some explain to me what is this 3:4:6:8 scaling ratio? How do I use it, and what is the logic behind it?

Suppose I have a 50x50 px image in ldpi folder. If I am going to use 3:4:6:8 ratio. What will be the next image size for my mdpi folder and hdpi folder?

Please help. I dont realy understand that scaling ratio. Sorry for this, I'm only a newbie in android design.

score 1 · Answer 1 · edited Jun 20 '20 at 09:12

1

Its so simple.

If image size is 50*50 for Ldpi then:

MDPI => 67*67

HDPI => 100*100

XHDPI => 125*125

edited Jun 20 '20 at 09:12

Community

1
1

answered Jun 23 '12 at 06:55

Paresh Mayani

127,700
71
241
295

thank you for your answer. can u please explain how did it happen?? what is the formula of that? – nelzkie Jun 23 '12 at 06:57
Im sorry. For me that is not simple. How did you get the 67x67 size from 50x50? please tell? T_T – nelzkie Jun 23 '12 at 07:01
3

@nelzkie If 3 is having 50 then what is for 4? so Equation is like (50*4)/3 – Paresh Mayani Jun 23 '12 at 07:29

score 1 · Accepted Answer · answered Jun 23 '12 at 06:58

1

Mostly they use these standard sizes:

ldpi: 36*36 mdpi: 48*48 hdpi: 72*72 xhdpi: 96*96

answered Jun 23 '12 at 06:58

Yogesh Somani

2,624
3
21
34

if the image is 36*36 then how did it become 48*48? did you multiply it?? by what number? – nelzkie Jun 23 '12 at 07:01
ldpi/mdpi=3/4 => 4*ldpi=3*mdpi; => if ldpi=36 => mdpi*3=4*36 => mdpi=144/3=48; Similarly, mdpi/hdpi=4/6 => 6*mdpi=4*hdpi and so on.... – Yogesh Somani Jun 23 '12 at 07:09
so mdpi = (4/3)*ldpi; hdpi = (6/4)*mdpi ; xhdpi = (8/6)* hdpi; This way can relate all the resolutions to each other. – Yogesh Somani Jun 23 '12 at 07:14
so it means that 3:4:6:8 is 3/4/6/8? – nelzkie Jun 23 '12 at 07:15

score 0 · Answer 3 · answered Feb 26 '14 at 21:20

0

You can use this simple tool to figure out the conversions. it doesn't have the xxhdpi, but you can easily modify it to calculate it for you

answered Feb 26 '14 at 21:20

Bassam Mehanni

14,796
2
33
41

Scaling ratio in Android images?

3 Answers3

Linked