StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

POWhy does this basic imagejpeg() resizer returns a black image?
primarykey
Id
19551747
data
AcceptedAnswerId
19630211
AnswerCount
3
ClosedDate
CommentCount
5
CommunityOwnedDate
CreationDate
2013-10-23T20:33:17.313
FavoriteCount
0
LastActivityDate
2013-10-30T07:32:38.437
LastEditDate
2013-10-29T21:53:26.477
LastEditorUserId
2434948
OwnerUserId
2434948
ParentId
0
PostTypeId
1
Score
3
ViewCount
3123
LastEditorDisplayName
text
Body
EDIT Thanks for all your answers, especially @Mailerdaimon who noticed that I wasn't using the computed values in the <code>imagecopyresampled</code> function. I don't get black images anymore, but i still do get some black part so i figure my ratio formula should be updated : if i upload a landscape image, the height of the new image is smaller than 170px, and then there's some black showing. How can i make sure the height of the image goes all the way ? <hr> Below is a simple script to allow users upload pictures. Once the upload is done, the pictures are displayed as a 170px(h) x 150px(w) thumbnail. The resize part does work since the output image is 170x150px BUT i still get some black area if <pre><code>if ($_SERVER["REQUEST_METHOD"] == "POST") { $maxWidth = 150; $maxHeight = 170; $name = $_FILES ['image'] ['name']; $type = $_FILES ["image"] ["type"]; $size = $_FILES ["image"] ["size"]; $tmp_name = $_FILES ['image'] ['tmp_name']; list($originalWidth, $originalHeight) = getimagesize($tmp_name); if ($originalWidth > $originalHeight) { $thumbnail_height = floor(($originalHeight/$originalWidth)*$maxWidth); $thumbnail_width = $maxWidth; } else { $thumbnail_width = floor(($originalWidth/$originalHeight)*$maxHeight); $thumbnail_height = $maxHeight; } // Resample $image_p = imagecreatetruecolor($maxWidth, $maxHeight); imagecreatefrompng($tmp_name); imagecopyresampled($image_p, 0, 0, 0, 0, $thumbnail_width, $thumbnail_height, $originalWidth, $originalHeight); //start upload process $RandomNumber = uniqid(); $location = "uploads/$RandomNumber"; imagejpeg($image_p, $location, 100); $sql=query("UPDATE users SET image = '".$location."' WHERE id = '$id'"); } } </code></pre> Any idea what I'm doing wrong?
Tags
<php><image><image-processing><upload><gd>
Title
Why does this basic imagejpeg() resizer returns a black image?
singulars
PostAcceptedAnswerId
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
PostParentId
1. This table or related slice is empty.
PostTypePostTypeId
1. PTQuestion
UserLastEditorUserId
1. USCaro_deb
UserOwnerUserId
1. USCaro_deb
plurals
PostLinksPostIdRelatedPostId
1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
2. PO
 singulars
 PostTypePostTypeId
 PTAnswer
3. PO
 singulars
 PostTypePostTypeId
 PTAnswer
VotesPostIdCreationDate
1. VO
 singulars
 PostPostId
 POWhy does this basic imagejpeg() resizer returns a black image?
 UserUserId
 USCaro_deb
 VoteTypeVoteTypeId
 VTBountyStart
2. VO
 singulars
 PostPostId
 POWhy does this basic imagejpeg() resizer returns a black image?
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTUpMod
3. VO
 singulars
 PostPostId
 POWhy does this basic imagejpeg() resizer returns a black image?
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTUpMod
CommentsPostId

Querying!

Guidance

A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.