black border arpund png images

Hi Rachel

Here's an example of the image https://petermeenagh.co.uk/snares.png

Here's the Diagnostics Report. I've changed the site url and some of my clients info in this.

Perch information

Perch: 2.8.19
Production mode: Production (100)
Installed apps: content (2.8.19), assets (2.8.19), categories (2.8.19), perch_shop_paypal (1.2.3), perch_members (1.3)
DB driver: PDO
DB tables: perch2_categories, perch2_category_counts, perch2_category_sets, perch2_content_index, perch2_content_items, perch2_content_regions, perch2_members, perch2_members_forms, perch2_members_member_tags, perch2_members_sessions, perch2_members_tags, perch2_navigation, perch2_navigation_pages, perch2_page_templates, perch2_pages, perch2_resource_log, perch2_resource_tags, perch2_resources, perch2_resources_to_tags, perch2_settings, perch2_shop_categories, perch2_shop_log, perch2_shop_orders, perch2_shop_product_options, perch2_shop_products, perch2_shop_products_to_categories, perch2_user_privileges, perch2_user_role_privileges, perch2_user_roles, perch2_users
Users: 3
App runtimes:

<?php
    $apps_list = array(
        'content', 
        'categories',
        'perch_shop_paypal',
        'perch_members',
    );

Editor plug-ins: ckeditor, markitup
H1: 15139cccc04346f9abb0c4ed5a5508c9
L1: 4213fc09b9f1d216b16600e41659f8fe
headerColour: #ffffff
content_singlePageEdit: 1
helpURL:
siteURL: /
hideBranding: 1
content_collapseList: 1
lang: en-gb
update_2.8.19: done
latest_version: 2.8.15
on_sale_version: 2.8.27
headerScheme: light
hide_pwd_reset: 1
perch_shop_paypal_email: emailaddress_here
perch_shop_product_url: /shop/product.php?s={productSlug}
dashboard: 0
content_hideNonEditableRegions: 0
content_frontend_edit: 0
perch_shop_display_oos: 0
logoPath: /admin/resources/1450671576_admin-logo.png
PERCH_DEVELOPMENT: 10
PERCH_STAGING: 50
PERCH_PRODUCTION: 100
PERCH_DB_USERNAME: perchuser
PERCH_DB_SERVER: mysql.sitename.co.uk
PERCH_DB_DATABASE: andante_perch_db
PERCH_DB_PREFIX: perch2_
PERCH_TZ: UTC
PERCH_EMAIL_FROM: david@sitename
PERCH_EMAIL_FROM_NAME: David
PERCH_LOGINPATH: /admin
PERCH_PATH: /home/SITENAME/SITENAME/admin
PERCH_CORE: /home/SITENAME/SITENAME/admin/core
PERCH_RESFILEPATH: /home/SITENAME/SITENAME/admin/resources
PERCH_RESPATH: /admin/resources
PERCH_HTML5: 1
PERCH_RUNWAY:
PERCH_ERROR_MODE: DIE
PERCH_DATE_LONG: %d %B %Y
PERCH_DATE_SHORT: %d %b %Y
PERCH_TIME_SHORT: %H:%M
PERCH_TIME_LONG: %H:%M:%S
PERCH_RUNWAY_ROUTED:
PERCH_DEBUG:
PERCH_PREVIEW_ARG: preview
PERCH_TEMPLATE_PATH: /home/SITENAME/SITENAME/admin/templates
PERCH_DEFAULT_DOC: index.php
PERCH_DEFAULT_EXT: .php
PERCH_PRODUCTION_MODE: 100
PERCH_RWD:
PERCH_HTML_ENTITIES:
PERCH_SSL:
PERCH_STRIPSLASHES:
PERCH_PROGRESSIVE_FLUSH: 1
PERCH_AUTH_PLUGIN:
PERCH_DB_CHARSET: utf8
PERCH_DB_PORT:
PERCH_DB_SOCKET:
PERCH_SESSION_TIMEOUT_MINS: 20

Hosting settings

PHP: 5.6.19
Zend: 2.6.0
OS: Linux
SAPI: cgi-fcgi
Safe mode: not detected
MySQL client: mysqlnd 5.0.11-dev - 20120503 - $Id: 76b08b24596e12d4553bd41fc93cccd5bac2fe7a $
MySQL server: 5.6.25-log
Extensions: Core, date, ereg, libxml, pcre, sqlite3, filter, mbstring, SPL, PDO, Reflection, pdo_sqlite, hash, session, cgi-fcgi, bcmath, bz2, calendar, ctype, curl, dom, standard, ftp, gd, gettext, exif, iconv, imap, json, mcrypt, mysqlnd, mysqli, openssl, pcntl, pdo_mysql, posix, pspell, mysql, SimpleXML, soap, sockets, tokenizer, xml, xmlreader, xmlrpc, xmlwriter, xsl, zip, zlib, imagick, mhash, Zend OPcache
GD: Yes
ImageMagick: Yes
PHP max upload size: 64M
PHP max form post size: 65M
PHP memory limit: 90M
Total max uploadable file size: 64M
Resource folder writeable: Yes
Session timeout: 24 minutes
Native JSON: Yes
Filter functions: Yes
Transliteration functions: No
PATH: /bin:/usr/bin:/sbin:/usr/sbin
RAILS_ENV: production
SCRIPT_NAME: /admin/core/settings/diagnostics/index.php
REQUEST_URI: /admin/core/settings/diagnostics/?extended
QUERY_STRING: extended
REQUEST_METHOD: GET
SERVER_PROTOCOL: HTTP/1.1
GATEWAY_INTERFACE: CGI/1.1
REMOTE_PORT: 64483
SCRIPT_FILENAME: /home/SITENAME/SITENAME/admin/core/settings/diagnostics/index.php
SERVER_ADMIN: webmaster@SITENAME
DOCUMENT_ROOT: /home/SITENAME/SITENAME
REMOTE_ADDR: 5.80
SERVER_PORT: 80
SERVER_ADDR: 173.236
SERVER_NAME: sitename
SERVER_SOFTWARE: Apache
HTTP_CONNECTION: close
HTTP_COOKIE: cmsa=1; PHPSESSID=IRm0jXrjisxvLXMNevgOe0
HTTP_REFERER: https://sitename/admin/core/settings/diagnostics/
HTTP_DNT: 1
HTTP_ACCEPT_ENCODING: gzip, deflate
HTTP_ACCEPT_LANGUAGE: en-US,en;q=0.5
HTTP_ACCEPT: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
HTTP_USER_AGENT: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:44.0) Gecko/20100101 Firefox/44.0
HTTP_HOST: sitename
DH_USER: siteuser
dsid: 30419852
SCRIPT_URI: https://sitename/admin/core/settings/diagnostics/
SCRIPT_URL: /admin/core/settings/diagnostics/
UNIQUE_ID: Vu@7363s4JgAABAIHUcAAAAL
FCGI_ROLE: RESPONDER
PHP_SELF: /admin/core/settings/diagnostics/index.php
REQUEST_TIME_FLOAT: 1458551775.7426
REQUEST_TIME: 1458551775

The image has only black and white as the colours.

Yes the black fringing around the the image is what I meant and this is being added whenever the image is being resized.

1417 x 1417

I'm not sure either. It's fine whenever not resized and I've tried density="2" on the images but still the same issue.

I haven't yet. Might give that a go and see. Could it be the way the png is initially saved before it is uploaded?