# Locator with Integer value coordinates [closed]

I want to get the Pixel value of an image.and here is my code

DynamicModule[{p = {50, 50}},
{Show[img, Graphics[Locator[Dynamic[p]]]],
ImageValue[img, Dynamic[p]]}]


and it came up with a warning that p is with a non integer value, to solve the problem ,I used Floor to get an integer value

DynamicModule[{p = {50, 50}},
{Show[img, Graphics[Locator[Dynamic[p]]]],
ImageValue[img,Floor/@Dynamic[p]]}]


this time it still doesnt work, with a warning:

    ImageValue::imgrng: The specified argument Floor[p\$20303] should be a pair of real or      integer numbers or a list of those.


My question is ,can I strict the loactor to Integer Domain?or is there any more elegent way to deal with this problem?

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The approach is almost good. However Dynamic[p] has Head Dynamic and some functions are not able to cooperate with it so you have to move Dynamic outside. You may also want to take a look at related locator on a png file. (pay attention to the coordinates which are relevant in your case) –  Kuba Sep 10 at 6:03
@Kuba,tks, as you said, I fixed the problem, it works well now –  tintin Sep 10 at 6:05

## closed as off-topic by Kuba, Artes, m_goldberg, István Zachar, sschSep 10 at 15:49

This question appears to be off-topic. The users who voted to close gave this specific reason:

• "This question arises due to a simple mistake such as a trivial syntax error, incorrect capitalization, spelling mistake, or other typographical error and is unlikely to help any future visitors, or else it is easily found in the documentation." – Kuba, Artes, m_goldberg, István Zachar, ssch
If this question can be reworded to fit the rules in the help center, please edit the question.

Kuda's help is quite useful, it helps me to fix the problem,

The thing is that Floor[Dynamic[p]]would not work properly, so ImageValue can't be updated.

So, After moving the Dynamicout side the ImageValue,it works

DynamicModule[{p = {50, 50}},
{Show[img, Graphics[Locator[Dynamic[p]]]],
Dynamic[ImageValue[img, Floor /@ p]]}]


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